You need to file a modification of the custody agreement. If mom will agree to sign the paperwork, it's quick and easy. If she won't, it will still be approved since you have had the child in your home for over 6 months.
Look on this website for an attorney to assist you with the paperwork.
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Follow Ms. Brochstein's advice. You can also request child support from the mom, and the repayment of the last 9 months. Consult a Family attorney in your area. Many, like myself, give a free initial consult and can give you clearer guidance based on all the specific facts of your case.
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