oh, forget one more point about 找律师帮助要小孩的监管抚养权利

You almost have ZERO chance to get the custody for your son. I believe that most state doesn't grant bio-father the right of the custody only because he is the son's bio-father. You can research the law in your state.

However, if the mother is actively using drugs, or commited crime, or you can prove that the step father is very abusive to the son, then you may have slim chance.