Well without any guardianship in place from your sister, you may be out of luck here. He is her father, and you, at this point, have no legal right to custody. Is there isn't a support order in place, he isn't required to pay anything. (morally of course, he should, but there is no legal recourse) There is nothing police will do without a court order. Without a custody order, he has the same custody rights that your sister has. If he has stepped in when he was needed and is now taking care of his child, I doubt that a court will give you custody without proof that he is a danger to the child. I think that the best thing you can do is to work with him to make sure that your niece has a stable home environment and continues to receive your love and support. If you can prove that he is a danger to her, then you need to take your information to both the department of social serices and police.
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