Hey, I think you should have a talk with him and when I say "talk "not about bad mouthing you but Have a conversation, by the looks of it he's hurting inside, that why he's bad mouthing you to his daughter. As a Man and a Father I don't agree with he's action, he's wrong for doing that and using his daughter against her mom. He thinks he's hurting you by bad mouthing you but little does he know he's hurting his daughter. I don't know how's the relationship between you and him is, but if y'all could sit down and have a conversation with him that can be a start. Talk about each other and how ya'll feel about each other and then talk about Family and co-parenting on how you both want to raise your daughter and if Y'all need to go to a family therapist like GNat suggested go. In the long run is your daughter that's going to be affected by all this. Hope he stop being childish and Man up already. Have a Bless day!
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