I do/don't You do/don't He/She/It does/doesn't We do/don't You do/don't They do/don't So, the verb changes only for he, she and it. In your case, talking about your parents you talk about THEM. So: My parents (they) don't have a car. I hope that makes it clear :)

Ezedequias, the correct way would be, "My parents don't have a car". Don't is the contraction of do not 😊

My parents don't have a car.

My parents do not have or don't have -- a car.

"don't"