Hi,
I'm trying to find the title of a movie from the late 80's or 90's. I just remember two specific scenes from the movie. First, a toddler witnessed his mother being killed by a man while he's siting in the back seat of a car late at night. His mother is killed while she's siting in the driver's seat. After the death of the mother, the toddler and his brother live with their father and his new girlfriend. One day, while they played in the garage, they found two coffins that seem to be built for them. The new girlfriend suspected the father for building the coffins for the two boys.

If you have any idea what could be this movie title, just tell me please. I've been looking for this movie for years!

Thank you,
DOL