Q: My child is 19. Can I be sued for anything he does?
A: Anything is a broad term. If, for example, a parent negligently gives a car to their child, they could be sued even if the child is over 18. Also, you can be sued if your child is driving a car you own and involved in a crash or walking a dog you own and it bites someone.
However, the short answer is that there are situations where a parent can be sued for acts of an adult child.