No way, don't risk it.. He has probably manipulated this girl and she will just think you are the jealous ex girlfriend trying to cause trouble.. Kepp your family safe. xx
Yep that

You now have a beautiful family growing, and you dont want someone like this person back in it, to ruin it.
This girl is not going to listen to you and if she is a young girl, knowing them, she is going to do it to spite you instead..
I would just think that you have experienced hell and survived and now are happy and comfortable something he may never have.

Huge hugs hun, definently not easy