My sister was in an abusive relationship and had a child, she left the child's father and came to live with me and my mother. My nephew is now 4 years old and since my mother and myself have provided for the child. My sister took no responsibility for the child, she never took care of him. She works the 1st shift as a CNA, she gets out at 3pm and would come home shower,change and go out to party, she would get to work intoxicated and not come home for days. My nephew never wants to go anywhere with her because he's scared that she's going to drop him off at his father's place and he hits him. My sister has a serious drinking problem. Is there anything my mother or I can do to gain custody of him?