Dad is having an affair with his newly remarried cousin because we are related. As children, we don't know what to do.

Methods 1: Talk to your father alone, talk about your own thoughts and your mother's situation, ask his feelings and thoughts, and let him try to think from the perspective of mother and child. Then let him make a decision.

Method 2: Talk to your aunt alone and ask her why she is having an affair with her father.

Ask her: If another woman had an affair with her uncle, what would you think and how to deal with it?

Tell me about your uncle, mom and dad and your situation, and let him try to think from the perspective of uncle and mom. Then let her make a decision.