(CNN) From his bed next to the window, Jadon squeezes his father's finger with all his might, even under heavy sedation. Anias rests in a bed near the door of the room, a testament to strength and resilience.

Just the sight of the boys in separate beds came as a surprise to their parents.

"It's shockingly new," said their mother, Nicole McDonald. The boys have shared a bed since birth.

Born conjoined at the head, the 13-month-old twins -- little "warriors," their parents call them -- spent the weekend recovering from the 27-hour surgery that separated them.

"I can't wait to put them beside each other and them see each other," said Christian, their father. "To be honest, I'm just so excited and anxious to see that moment. That's going to be a great day."

Photos: Conjoined twins at the head prepare to be separated Anias and Jadon McDonald were born conjoined at the head on September 9, 2015, via an unscheduled C-section. "They were normal little boys, like any other two little babies you would see," said their father Christian McDonald, "except for being conjoined." Hide Caption 1 of 13 Photos: Conjoined twins at the head prepare to be separated "Don't worry," Nicole McDonald said to her husband when she told him about being pregnant with conjoined twins. "We'll figure it out." Hide Caption 2 of 13 Photos: Conjoined twins at the head prepare to be separated "I can't wait to see them as two separate little boys," said Christian. "That's what excites me the most. I really just want to know my boys." Hide Caption 3 of 13 Photos: Conjoined twins at the head prepare to be separated The parents describe Jadon, left, as the rambunctious one, and Anias as the contemplative one who loves listening to his mom read. Hide Caption 4 of 13 Photos: Conjoined twins at the head prepare to be separated When the boys were younger they could be transported in a kid's wagon, seen here when they were three months old at Rush University Medical Center in Chicago. Hide Caption 5 of 13 Photos: Conjoined twins at the head prepare to be separated Anias stares into the camera. His gaze is so captivating, his mother says, "it's like he looks at your soul ... He's just a silent warrior. He's sweet and strong." Hide Caption 6 of 13 Photos: Conjoined twins at the head prepare to be separated Nicole and Christian McDonald at their home in the Bronx. Hide Caption 7 of 13 Photos: Conjoined twins at the head prepare to be separated The boys also have a 3-year-old brother, Aza. He's grown more quiet in recent weeks ahead of the twins' surgery. Hide Caption 8 of 13 Photos: Conjoined twins at the head prepare to be separated The boys share 1.5 to 2 inches in diameter of brain tissue. The surgery to separate them could take as long as 20 hours. Hide Caption 9 of 13 Photos: Conjoined twins at the head prepare to be separated Only one out of every 2.5 million live births results in twins conjoined at the head. But 80% of them die of medical complications by the age of 2 if not separated. Hide Caption 10 of 13 Photos: Conjoined twins at the head prepare to be separated Dr. James Goodrich, here with Nicole and the boys, is the most experienced craniopagus neurosurgeon in the world. Separating Anias and Jadon will mark his seventh separation surgery. He's consulted on 13 other conjoined twins. Hide Caption 11 of 13 Photos: Conjoined twins at the head prepare to be separated New 3D imaging and mapping has made this surgery unique and allows the surgical team to see exactly what to expect when they make the first incision. "There's no more guessing," said Goodrich. Hide Caption 12 of 13 Photos: Conjoined twins at the head prepare to be separated Christian and Nicole pose on the bed with their twins. Anias is on the left, while Jadon is facing his father. Hide Caption 13 of 13

72 critical hours

The surgery -- which began early Thursday and ended shortly before 1 p.m. Friday -- took place at the Children's Hospital at Montefiore Medical Center in the Bronx. It was led by neurosurgeon Dr. James Goodrich, considered the leading expert on what's known as craniopagus surgery.

The first 72 hours of recovery were most critical for long-term survival, doctors told the parents. Christian said the boys were stable and doing well after a weekend of challenges.

Anias suffered a few seizures on Saturday, including one that lasted for 45 minutes, Christian said. The seizures have since been brought under control with the anti-seizure medicine Ativan, he said.

Jadon has yet to move his left side. Though that is troubling, Christian remains optimistic. "That's not something really worrying Dr. Goodrich right now," the father said. "He says that's not out of the ordinary. Hopefully, in time, he will start moving that side."

Both boys have opened their eyes, although they are heavily sedated and hooked up to an array of medical equipment. They're too fragile for Mom and Dad to pick them up just yet.

"Jadon will squeeze your fingers and not let go, on his right side," said Christian. "They're really doing pretty good, considering the surgery they went through."

The parents are now in a waiting game as to when Jadon and Anias become fully alert.

Goodrich and lead plastic surgeon Dr. Oren Tepper said in a joint statement Monday afternoon that "so far, the recovery course has gone as expected."

"We are hoping to be able to extubate Jadon in the upcoming days, and Anias we expect to take longer as we work to control his blood pressure issues," the doctors said.

They added that both boys would probably have to undergo more reconstruction surgery: "We expect that parts of the incisions on both boys' heads will need some revision."

Long recovery ahead

The separation surgery was the fourth procedure for the boys -- and the most complicated. The twins awoke from the first two surgeries after about a week; after the third surgery, it took about a month "for them to be back to themselves," Christian said.

He expects a similar recovery this time. "The more difficult the surgery," he said, "the longer the recovery."

Dad spent a good bit of time this weekend bonding with the couple's 3-year-old son, Aza, while Mom camped out in the twins' room, loving every second of the reunion.

One of the most poignant moments occurred Friday afternoon as the parents waited for Anias to get out of surgery. Jadon had been wheeled out of the operating room about 7 that morning and brought up to the pediatric intensive care unit, or PICU, but Anias' operation was taking much longer.

Christian plopped to the floor of the PICU. Nicole bent over in agony. They'd been told Anias would be brought there any moment, but a 20-minute wait turned into an hour.

"Come on, little Anias," Dad said. "I can't wait to see you, Buddy."

Suddenly, about 1 p.m., medical personnel with dark circles under their eyes emerged from the elevator. Nicole stood with her hands clasped in prayer, Christian by her side. He wiped a tear from his right eye and put his arm around his wife of four years.

They'd waited for this moment since the boys were born at 11:11 p.m. on September 9, 2015 -- and even before that, when they first learned in May 2015 that the boys were conjoined in utero.

Their faces lit up when Anias was wheeled out. Excruciating agony gave way to pure joy and raw emotion. Nicole immediately kissed Anias on his left cheek, tears flowing down her face.

"Hey, Buddy, you look beautiful," Christian said, leaning in for a kiss and blowing on his forehead. "I love you, Pumpkin. You look just like your brother."

Anias was carefully pushed down the hall into the same corner room with Jadon.

Family reunited

Two nights earlier, in the same room, the boys had shared one bed. Christian had climbed into it, while Nicole read them the children's book "I Love You All The Same."

"You are strong, you are smart, you are happy," Nicole told them as they drifted to sleep.

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And now here the family was, together. There was even beauty with the exact time of separation, at 2:11 a.m. -- when the two conjoined boys became one and one.

Over the weekend, Nicole took to Facebook to thank the "heroes" at Montefiore -- from Goodrich to his nurse practitioner, from Tepper to anesthesiologists, from nurses to volunteers.

"As absolutely humbled as I am for all of the encouraging messages I've received, it's hard for me to take any credit for the miracle that these boys are," Nicole wrote . "All I did was birth beautiful, unique children and love them with all I have. There are mothers everywhere who do that on a daily basis. I'd like to direct the attention back to the true heroes of our story."

Both parents gave up their jobs and moved from their Illinois town of 5,000 to the Bronx to be near the hospital. They've been relying on donations to make ends meet over the last year, overwhelmed by the outpouring of support from complete strangers.

Since the surgery started, their GoFundMe page has swelled from some $50,000 to more than $250,000. The family is now asking anyone who wants to help the twins to instead make a donation to a family friend whose child is in need of a kidney transplant.

Faith and healing

Messages of support from strangers proved a powerful distraction during the hours of waiting while the twins were in surgery, Christian said. He and Nicole said they felt the love and prayers sent their way. They monitored the hashtag #JadonAndAnias as people tweeted about "our beautiful boys."

"If it wasn't for all these people sending us messages and donating, we wouldn't have been able to keep such a positive outlook," Christian said.

"What I really want to say to the thousands who supported us," Christian said, "is that we are blown away how total strangers can and do love our boys so much. And their love for our boys poured out of them through their messages and donations."

And that's something the McDonalds say they will never forget. It's been "a long, hard journey getting to this point," Christian added.

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"We're finally seeing the fruits of our labors and our long, hard nights."

In her Facebook post, Nicole said her family also couldn't have made it this far if it weren't for their faith.

"Without God we would have unraveled many, many months ago," she said. "People say we have handled this situation with grace, but it's with God's grace that we continue on."