Biological Dad VS Step Dad...In A Parental Crisis!!?

You're right not have anything to do with the father ever again. If when he is out of jail, he starts to take interest, then let him. He will try it to get to you and see if you will let him back in your life. There might even be a custody battle. Be aware. That is how he will try to get you back. Sounds like you brought stability back and that is what the child needs. Don't give in. Stay with your feelings they are right. Mothers usually get custody because of a tender year law. You don't need a deadbeat for a Dad.