Your parents have some beef they need to settle between themselves - not with you. Any parent requesting their kids to retaliate against the other parent is a red flag. It’s manipulation. Beware of her !

Now, if your dad had done something to you and you felt like cutting ties, or perhaps your dad represents a serious threat to your mother and cutting ties is necessary for her safety, well that’s a different case scenario. But that’s not what you are telling us.

TLDR: you are not a bad person.