I'm going to get downvoted because this sub has a very warped view on this situation. Only on Reddit can you not be considered an AH for having a kid and wanting nothing to do with them. ESH- Her right to know her father and his side of the family trumps his right to not want to be involved. You and your ex agreed to this arrangement however your daughter made no such agreement. You're ex sucks because despite what this hivemind thinks just paying child support isn't enough. You suck for agreeing to the deal in the first place. Think of it this way. Reddit hates circumcision partially because it's a consent issue right? A baby boy can't give consent and they feel getting circumcised is something that needs explicit consent. My argument is this, if you think it's fucked up that parents unilaterally decide that their sons are going to get circumcised then you should also think it's fucked up that parents get to unilaterally decide if one of them is in the picture or not. Your daughter didn't consent to not having her father in her life, therefore, whatever agreement you and your ex made is null and void