Two prominent Ontario families, including the one of a man convicted in a horrific drunk driving crash that killed three children and their grandfather, have donated millions of dollars to a new hospital in Vaughan, Ont.

In March 2016, 30-year-old Marco Muzzo was sentenced to 10 years in prison for impaired driving causing death and bodily harm over the 2015 crash. On Thursday, it was revealed that the Muzzo family, along with the De Gasperis family, have made a joint donation of $15 million to help build the Mackenzie Vaughan Hospital, which is slated to open in 2020. It is the largest single donation in the hospital’s history.

In an interview with CTV Toronto, Mackenzie Health Foundation CEO and president Ingrid Perry said that the hospital is “absolutely delighted with the generosity of the De Gasperis and Muzzo families.”

Still, Perry admitted that the matter is “a very sensitive, difficult issue for all the families involved.”

“We certainly are aware of it,” Perry said. “We also have a responsibility here at Mackenzie Health Foundation… for raising over $250 million towards our new hospital here that’s planned for Vaughan and that will care of tens of thousands of people here in the community.”

Perry stated that the two families have a “long history of philanthropy.”

“Our relationship goes back decades,” she said.

To recognize their contribution, the new hospital’s west wing will be named the “De Gasperis-Muzzo Tower.”

On Sept. 27, 2015, Marco Muzzo ran through a stop sign in Vaughan while driving twice the speed limit, T-boning a van and killing three children, aged two, five and nine, as well as their 65-year-old grandfather. The children’s grandmother was also seriously injured in the crash. According to a toxicologist’s report, Marco Muzzo had roughly three times the legal blood alcohol limit at the time of the collision.

“(W)e hope (others) will follow the examples set by the De Gasperis and Muzzo families, and by all our very generous donors who have made a commitment to our new hospital,” Perry said in a written statement announcing the donation.

The De Gasperis and Muzzo families are reportedly worth $1.7 and $1.8 billion respectively.

With files from CTV Toronto