(CNN) Former President George H.W. Bush and former first lady Barbara Bush are "both on the upswing," Bush family spokesman Jim McGrath said Thursday, adding, "they may not be out of the woods yet, but we can see the edge of the forest."

McGrath said Barbara Bush continues to be treated for her bronchitis with antibiotics, and she said she feels "a thousand percent better today."

He said President Bush 41 is also on the upswing. He is alert and remains in stable condition in intensive care, and he said the good news he is being actively evaluated for having his breathing tube removed.

"He is doing better -- of course he has a ways to go -- but it's hard not to be encouraged," McGrath said Thursday night.

McGrath said both had a great night's sleep.

Their son Neil Bush has been over to visit. No other family members are flying in because they feel everything is stable and moving in the right direction.

Former President George W. Bush is still going to the inauguration, McGrath said.

The 92-year-old former President was admitted to the intensive care unit at Houston Methodist Hospital to address "an acute respiratory problem stemming from pneumonia. Doctors performed a procedure to protect and clear his airway that required sedation," McGrath said in an earlier statement.

By Wednesday evening, the former President was no longer sedated.

McGrath told CNN doctors wanted to keep George H.W. Bush in ICU for observation, because he's still intubated and their intention is to keep his airway open.

At first, McGrath reported that he was responding well to the drugs. But Wednesday, the 41st President's condition changed and he was admitted to the intensive care unit, sedated and intubated.

"It's definitely very concerning," said Dr. Sanjay Gupta, CNN's chief medical correspondent, who noted that it is the first time President Bush has been intubated to protect his airway. "Certainly when someone is sedated, they're having trouble breathing on their own."

Barbara Bush treated with antibiotics

Barbara Bush also was admitted to the hospital Wednesday morning as a precaution after "experiencing fatigue and coughing," McGrath said in the same initial statement.

McGrath said Wednesday evening the first lady has bronchitis, not pneumonia like her husband.

Photos: President George H.W. Bush's life in pictures Photos: President George H.W. Bush's life in pictures President George H.W. Bush attends the Republican National Convention in Houston in 1992. Bush dedicated his life to serving others and held many different roles in government, the highest being President. Hide Caption 1 of 47 Photos: President George H.W. Bush's life in pictures Bush is pictured with his sister, Mercy, in 1929. He was born June 12, 1924, in Milton, Massachusetts. Their father, Prescott Bush, was a successful Wall Street banker who became a US senator in 1952. Hide Caption 2 of 47 Photos: President George H.W. Bush's life in pictures Bush sits in his VT-51 Avenger in 1945. Two years earlier, he became the youngest pilot in the US Navy. He flew 58 combat missions in World War II and was awarded three Air Medals and the Distinguished Flying Cross. Hide Caption 3 of 47 Photos: President George H.W. Bush's life in pictures After the war, Bush attended Yale University and played baseball there from 1945 to 1948. He was team captain. Hide Caption 4 of 47 Photos: President George H.W. Bush's life in pictures Before he entered politics, Bush made a fortune drilling for oil in Texas. He created the Zapata Offshore Co., which introduced a new era in the drilling industry. Hide Caption 5 of 47 Photos: President George H.W. Bush's life in pictures Bush is pictured with his wife, Barbara, during his first campaign for Congress. He represented Texas' 7th District from 1967 to 1971, and he was appointed to the powerful tax-writing Ways and Means Committee. Hide Caption 6 of 47 Photos: President George H.W. Bush's life in pictures Bush represents the United States at the United Nations in 1971. He served as US Ambassador from that year until 1973. Hide Caption 7 of 47 Photos: President George H.W. Bush's life in pictures Bush sits with members of his family in 1971. He met his wife at a country club dance in 1941, and they were married in 1945. They had six children. Hide Caption 8 of 47 Photos: President George H.W. Bush's life in pictures Under President Gerald Ford, Bush served as the chief liaison to China in 1975. Here, Bush greets well-wishers in Beijing. Hide Caption 9 of 47 Photos: President George H.W. Bush's life in pictures Ford meets with Bush in December 1975 to talk to about Bush taking over as director of Central Intelligence. Hide Caption 10 of 47 Photos: President George H.W. Bush's life in pictures The Bushes stand with Republican presidential nominee Ronald Reagan and his wife, Nancy, in 1980. Bush lost to Reagan in the primaries but became his running mate. Hide Caption 11 of 47 Photos: President George H.W. Bush's life in pictures Bush and House Speaker Tip O'Neill listen to Reagan deliver his second State of the Union address in 1983. Hide Caption 12 of 47 Photos: President George H.W. Bush's life in pictures Reagan shakes hands with Bush in 1988. Bush served as Reagan's vice president from 1981 to 1989, and he would succeed him as President. Hide Caption 13 of 47 Photos: President George H.W. Bush's life in pictures The Bushes pose for a 1986 photo in Kennebunkport, Maine. Hide Caption 14 of 47 Photos: President George H.W. Bush's life in pictures The Reagans and the Bushes join hands after President Reagan endorsed Bush's presidential run at a dinner in 1988. Hide Caption 15 of 47 Photos: President George H.W. Bush's life in pictures Bush poses for a photo with real estate mogul and future President Donald Trump during a campaign event in 1988. Hide Caption 16 of 47 Photos: President George H.W. Bush's life in pictures Bush debates Democratic presidential candidate Michael Dukakis in 1988. Hide Caption 17 of 47 Photos: President George H.W. Bush's life in pictures Bush joins supporters in Houston after learning he had defeated Dukakis in the presidential election. Hide Caption 18 of 47 Photos: President George H.W. Bush's life in pictures Shortly after winning the election, Bush casts a line while surf fishing in Gulf Stream, Florida. Hide Caption 19 of 47 Photos: President George H.W. Bush's life in pictures Soviet leader Mikhail Gorbachev takes in the New York skyline with Reagan and Bush in 1988. Hide Caption 20 of 47 Photos: President George H.W. Bush's life in pictures Bush was sworn into office as the 41st president of the United States on January 20, 1989. First lady Barbara Bush holds the Bible for her husband while Chief Justice William Rehnquist administers the oath of office. Hide Caption 21 of 47 Photos: President George H.W. Bush's life in pictures President Bush delivers his first State of the Union address to a joint session of Congress on January 31, 1990. Hide Caption 22 of 47 Photos: President George H.W. Bush's life in pictures Bush holds up a plastic bag with crack cocaine during a televised speech about drugs in 1989. Weeks later it was revealed that government agents had bought the drugs from a dealer in front of the White House for the purpose of Bush's speech. Hide Caption 23 of 47 Photos: President George H.W. Bush's life in pictures Bush hosted Nelson Mandela, South Africa's anti-apartheid leader and future president, at the White House in June 1990. Hide Caption 24 of 47 Photos: President George H.W. Bush's life in pictures Bush and the first lady wave goodbye to US Marines and British troops after a Thanksgiving Day visit to Saudi Arabia in 1990. Hide Caption 25 of 47 Photos: President George H.W. Bush's life in pictures Bush and Colin Powell, the chairman of the Joint Chiefs of Staff, speak on separate phones in February 1991 while Joint Chiefs John Sununu, Robert Gates and Brent Scowcroft listen to a conversation about halting the Gulf War. Hide Caption 26 of 47 Photos: President George H.W. Bush's life in pictures Bush, at his vacation home in Kennebunkport, meets with Supreme Court nominee Clarence Thomas in 1991. Bush also appointed Justice David Souter in 1990. Hide Caption 27 of 47 Photos: President George H.W. Bush's life in pictures Bush plays golf with tennis player Andre Agassi in 1991. Hide Caption 28 of 47 Photos: President George H.W. Bush's life in pictures Bush and Gorbachev shake hands at the end of a news conference in Moscow in July 1991. Hide Caption 29 of 47 Photos: President George H.W. Bush's life in pictures From left, Presidents Bush, Reagan, Jimmy Carter, Gerald Ford and Richard Nixon stand together at the dedication of the Ronald Reagan Library in 1991. It was the first time five presidents gathered in one place. Hide Caption 30 of 47 Photos: President George H.W. Bush's life in pictures Bush and Vice President Dan Quayle join hands at the 1992 Republican National Convention in Houston. They are joined by their wives, Marilyn Quayle and Barbara Bush. Hide Caption 31 of 47 Photos: President George H.W. Bush's life in pictures Bush checks his watch during a 1992 presidential debate with Ross Perot, right, and Bill Clinton. The memorable moment was interpreted as the President being out of touch. Hide Caption 32 of 47 Photos: President George H.W. Bush's life in pictures Bush takes a last look around the Oval Office with his dog, Ranger, before vacating the White House for Bill Clinton. Hide Caption 33 of 47 Photos: President George H.W. Bush's life in pictures Bush's eldest son, George Walker Bush, was elected President in 2000. They became the second father-son duo in history to hold the office (the first being John Adams and John Quincy Adams). The two Georges hug here moments after the youngest was sworn in on January 20, 2001. Hide Caption 34 of 47 Photos: President George H.W. Bush's life in pictures With his father by his side, President George W. Bush sits at his desk in the Oval Office for the first time on Inauguration Day, January 20, 2001. Hide Caption 35 of 47 Photos: President George H.W. Bush's life in pictures Bush rides a Segway at his home in Kennebunkport, Maine, in 2003. Hide Caption 36 of 47 Photos: President George H.W. Bush's life in pictures Celebrating his 80th birthday in 2004, Bush performs one of two skydiving jumps he completed with the Army Golden Knights. Hide Caption 37 of 47 Photos: President George H.W. Bush's life in pictures In 2005, President George W. Bush appointed his father and Bill Clinton to lead fundraising efforts for victims of Hurricane Katrina. Hide Caption 38 of 47 Photos: President George H.W. Bush's life in pictures Bush arrives on the South Lawn of the White House in 2008. Hide Caption 39 of 47 Photos: President George H.W. Bush's life in pictures President Barack Obama presents Bush with the Medal of Freedom in February 2011. "His life is a testament that public service is a noble calling. ... His humility and his decency reflects the very best of the American spirit," Obama said. Hide Caption 40 of 47 Photos: President George H.W. Bush's life in pictures Barbara Bush kisses her husband as they arrive for the 2012 premiere of a documentary about his life. Hide Caption 41 of 47 Photos: President George H.W. Bush's life in pictures Bush, in the wheelchair, arrives for the dedication of his son's presidential library in Dallas in 2013. Joining him, from left, are President Barack Obama and former Presidents George W. Bush, Bill Clinton and Jimmy Carter. Hide Caption 42 of 47 Photos: President George H.W. Bush's life in pictures Bush holds up his wife's hand at a Republican presidential debate in 2016. One of their sons, former Florida Gov. Jeb Bush, was among the candidates in the debate. Hide Caption 43 of 47 Photos: President George H.W. Bush's life in pictures The Bushes participate in the ceremonial coin toss before the Super Bowl in 2017. Hide Caption 44 of 47 Photos: President George H.W. Bush's life in pictures Bush was admitted to a hospital in April 2017 for an acute respiratory problem stemming from pneumonia. This photo of him and his son George was posted to Twitter. "Big morale boost from a high level delegation. No father has ever been more blessed, or prouder," the elder Bush wrote about the photo. Hide Caption 45 of 47 Photos: President George H.W. Bush's life in pictures Bush joins former presidents and first ladies at the funeral ceremony for his wife in April 2018. Behind Bush, from left, are Laura Bush, George W. Bush, Bill Clinton, Hillary Clinton, Barack Obama, Michelle Obama and current first lady Melania Trump. Hide Caption 46 of 47 Photos: President George H.W. Bush's life in pictures Bush is seen in the car after a stay in the hospital. His son Jeb tweeted the photo in May 2018, saying, "My beloved dad is in Maine." Bush had been admitted to the hospital after contracting an infection that spread to his blood, a family spokesman said. Hide Caption 47 of 47

Bush, who served a single term as President from 1989 to 1993, was already not expected to attend the inauguration of President-elect Donald Trump in Washington on Friday due to health concerns.

Bush sent a letter to the President-elect on January 10, apologizing for missing the ceremony and saying that he and Barbara "wish you the very best as you begin this incredible journey of leading our great country."

"My doctor says if I sit outside in January, it likely will put me six feet under. Same for Barbara," Bush wrote, in a letter first reported by ABC News. "So I guess we're stuck in Texas."

Trump responded on Twitter Wednesday, wishing the Bushes a speedy recovery and thanking them for their note.

"Looking forward to a speedy recovery for George and Barbara Bush, both hospitalized. Thank you for your wonderful letter!" he tweeted.

Looking forward to a speedy recovery for George and Barbara Bush, both hospitalized. Thank you for your wonderful letter! — Donald J. Trump (@realDonaldTrump) January 18, 2017

President Barack Obama said at a White House news conference Wednesday his White House has been in touch with the Bush family.

"They have not only dedicated their lives to this country, they have been a constant source of friendship and support and good counsel" over the years, Obama said.

"They are as fine a couple as we know," he added, calling the Bushes "really good people."

Former President Bill Clinton, also offered his best wishes to his predecessor on Twitter.

"41 and Barbara—thinking about you both and sending wishes for a speedy recovery. Love, 42," he wrote.

41 and Barbara—thinking about you both and sending wishes for a speedy recovery. Love, 42. — Bill Clinton (@billclinton) January 18, 2017

The 41st president has, in fact, heard from all of the former presidents, along with Obama and Trump's teams.

President Bush also received a "get well" video from actress Suzanne Somers and his face lit up, McGrath said.

Previous health concerns

Bush revealed several years ago that he suffered from a form of Parkinson's disease that left him unable to walk. He uses a wheelchair or a scooter to get around and had two other health scares in 2014 and 2015.

In December 2014, he was hospitalized after experiencing shortness of breath, and the following July fell at his home in Kennebunkport, Maine, breaking the C2 vertebrae in his neck.

The injury did not result in any neurological problems, his spokesman said at the time.

CORRECTION: This story has been updated to accurately state the years George H.W. Bush served as president of the United States.