Family issues

My fiancés mom never follows rules I have for my daughter, like taking her outside in the cold with no jacket in a snow storm. I have told her if she doesn’t like the rules I have for my daughter she can’t watch her! My fiancé doesn’t stick up for me and claims I disrespected his mother in her own house. Not to mention he doesn’t do a damn thing to help me with his daughter I do EVERYTHING. I deal with this crap bcus his mother says she will sue me for grandparents rights… what to do