An Islip father returned home from the hospital Monday following a split-second decision to protect his son’s life on Halloween.

Richard McWilliams was struck by a car as he and his family were crossing the street to return home from trick-or-treating.

"I would do it all again to save my son,” McWilliams said. “I’m just so grateful that I’m still here and we still get to be there for each other, and I get to see my children grow up.”

He says last week's car accident plays over and over again in his head. This is what he says he remembers: a car with no headlights came toward him while he and his 10-month-old son Donatello crossed the street.

As he heard his sister scream and saw a car approaching, he pushed his son away to protect him.

"The only thing I can think to do with fatherly instinct was to shove the stroller as hard as I could across the street away from me and away from the car and hope that he didn't get hit," he said.

The family says the car hit the back of Donatello’s stroller and ejected him out of it. The 10-month-old suffered a concussion.

McWilliams heads back in for surgery to install metal rods into his leg so he can begin physical therapy and be able to walk again.

The accident, and his recovery, has also impacted his ability to work at his video game store in Bay Shore called Blast From The Past.

As he recuperates, he has several questions about the investigation and the state of the driver at the time of the accident.

"I don't understand how somebody could be so irresponsible on a night like Halloween when there's more kids than ever out on the streets and you're supposed to be safer than normal with your driving,” said McWilliams.

When Suffolk police first told News 12 about the accident, they said the baby hadn't been hit. News 12 also asked if Suffolk police could provide more details about the investigation. We are awaiting a response.

The family set up a GoFundMe to help raise money to cover medical expenses for McWilliams and his son. You can donate to the GoFundMe here.