This post leaves a really bad taste in my mouth.

Sorry, or not so sorry to play devil's advocate.

I think you're selfish to attempt to intervene in a relationship issue between a father and daughter when he's trying to help her. And you haven't even given him a chance to help her.

You entered into this relationship knowing full well he had a kid. I don't care how long she has, or has not lived or interacted with him.

It's his flesh and blood.

Period.