Taking off wirth a man you met on the internet with a young child is a BAD idea. Boyfriends injur and abuse their girlfriends kids all the time. Have you done any background on this guy? Where is your childs father? Your mom probably cannot declare you mentally incompotent but if you live under her roof, she can try and tricks she wants to keep the child in state. I suggest moving out on your own, filing for child support if you need it, and be responsible living on your own so that you do not have to depend on this guy to take care of you.