hI NEMO.
You might try to get the N arrested for his ?illegal occupation. A bit underhanded I know and likely quite difficult a task.
I'm glad there's supervised visitation. N dad will likely act like father of the year.
I wish there was more hope in these situations. Legally is the only way because the N will say that you are 'painting devils on the walls' and he really loves his son and you are jealous because he has found somebody else.
the cold truth is that he will do anythign to see you destroyed because of what you know.
Many mothers are not able to get supervised visitation and usually the courts opinion is that a child should not be kept from his father.