S.M.
I would definitely talk to the police and to the frined of the court, the new fiance has NO say in your children and can not withhold your child from you. I would not stand for it...document everything and contatc friend of the court every single time that it happens so that they have rela time proof not you just saying that it happened 3 weeks after the fact. My boyfriend went thru this and he ended up writing a letter everytime that it happened to him (30 letters in total), he would fax them over as soon as he could do that they would get them immediantly. It ended up helping him alot in the end to show that they were not following the order. Also, make sure you bring up that it is not even the parent, but someone who has no rights as far as the courts are concernd.
GOOD LUCK!