On social media, people are alleging the 29-year-old King resident and grandson of the late billionaire developer of the same name, had spent the weekend in Miami and used a private jet to return home.

It appears Marco Muzzo, the man charged with impaired driving in the deaths of three small children and their grandfather, was on his way back from his stag party and was scheduled to get married to his fiancee in a matter of weeks.

Correction: This story has been updated from a previous version. The stag party was in Miami.

The news comes as the Muzzo family, via Marco's mother, Dawn, released a statement sending out condolences to the victims and asking for privacy from the media.

"We are all greatly saddened by yesterday's (Sunday’s) tragedy and express our deepest sympathy and condolences to the Neville, Lake and Frias families. We would ask for the co-operation of the media in respecting the privacy of our family during this very difficult time."

Monday, Muzzo appeared in court one day after he was charged with impaired driving in the deaths.

He appeared at Newmarket courthouse Monday afternoon, where media reported he looked "crestfallen and exhausted”, adding his mother and fiancée attended and were emotional when he first appeared.

The 29-year-old King resident faces 18 charges, including four counts of impaired driving causing death in the horrific crash at Kirby Road and Kipling Avenue in Vaughan.

The victims include Daniel Neville-Lake, 9, Harrison Neville-Lake, 5, and Milagros (Millie) Neville-Lake, 2. Grandfather Gary Neville, 65, was also killed.

Jennifer Neville-Lake, the mother of the three children, said her mother and grandmother, were still in the hospital.

Josephine Frias and Neriza Neville are in stable condition.

"As you know all of my children have gone home to God with my dad," she said on a Facebook post.

Muzzo's bail hearing is Friday and, according to the Toronto Star, his bail will be contested by the Crown.

Other media have reported police sources said Muzzo had a blood alcohol level twice the legal limit and ran a stop sign before entering the intersection in his SUV and T-boning the vehicle, just after 4 p.m.

He has also been charged with four counts of driving over 80 causing death, four counts of dangerous operation of a vehicle causing death, two counts of impaired, dangerous operation of a vehicle and over 80, causing bodily harm.

Muzzo has run afoul of enforcement officers a few times, according to The Star, including paying a fine for being intoxicated in a public place in Richmond Hill and a speeding ticket for an offence in Newmarket in August 2013.

He also paid a ticket this year for a cellphone-related offence in Caledon.

Marco Muzzo Sr. was listed as 52nd on the wealthiest Canadians list, with an estate worth $1.7 billion.

He was one of the big three GTA suburban developers, running Marel Contractors in Vaughan and Pemberton Group in Toronto, employing 3,500 people in the construction industry.

Muzzo Sr. died at 73 in 2005 and his son, Marc, succeeded him as head of the firm. Muzzo Jr.’s father, Robert, died in 2004.

— with files from The Toronto Star