To the courts what makes a parent unfit?

The Court caqn prove a parent unfit, when the parent neglects a child,abuses said child,when the parent uses drugs/to much drinking, whne the home isn't clean, and when there is no food in the home.You can look up the web site to your state laws on unfit parents.Just go to you Google search. My ex tried that with me and I went in search for the laws on unfit parents, so my advise is study your child act laws for your state.