N-400 part 5 filling... HELP

[Cucumber23]

On the part 5 on N-400
1. were your parents married before your 18th birthday?

Should I answer yes or no to this question.

My parents is not a citizen both live in the US and they have Green card.. They're only married one time..

[MaryH]

If they were married before your 18 BD, then it would be yes.