Actually in my mind...the only thing to be questioned is: Does Jaycee want to see him? If not...shove off dude. She should never be forced to have a relationship with anyone she does not choose to....her power has already been taken away by a monster...her bioFather is only repeating that emotionally by trying to force her to do something against her will.
It is not just a question of Jaycee though (assuming she knows anything of this at all - it is quite possible she hasn't been told), it also involves the two grandchildren.
I could be wrong, but they might just have fairly strong feelings about being denied access to blood relatives. What about their choices?