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A sentencing hearing for a drunk driver who caused a horrific crash that killed three siblings and their grandfather last fall begins Tuesday.

Marco Muzzo arrived at a Newmarket, Ont. court at approximately 8:30 a.m. Tuesday morning.

The 29-year-old pleaded guilty earlier this month to four counts of impaired driving causing death, and two count of impaired driving causing bodily harm. He was released on $1 million bail.

Nine-year-old Daniel Neville-Lake, his five-year-old brother Harrison, their two-year-old sister Milly, and the children's 65-year-old grandfather, Gary Neville, died after the van they were in was T-boned by an SUV in Vaughan, Ont. on Sept. 27.

The children's grandmother and great-grandmother were also seriously injured in the crash.

On Tuesday morning, the children's mother Jennifer Neville-Lake thanked her family and friends for their "messages of love and support."

The judge is expected to hear statements from the Neville-Lake family and Muzzo over the course of the hearing.

A number of groups have also been granted permission to present community victim impact statements.

A Cub Scout leader and representatives from the Neville-Lake children's school are expected to address the court.

Muzzo's lawyer Brain Greenspan said Tuesday that he expects the sentencing hearing to run for two days.

A Newmarket, Ont. court heard that prior to the deadly crash, Muzzo had returned from a trip to Miami on a private jet.

Shortly after driving off from the airport in his SUV, Muzzo drove through a stop sign on Kipling Avenue and struck the minivan carrying the Neville-Lake family.