Short history- my husband was adopted and is an only child. His mom was abusive and still is, shes 73 and has multiple health and I suspect mental health issues. she is mean/ diagreeable and rude in public. He says she's always been that way. I don't know how I'll keep my sanity if she moves in.. I applied for guardianship of my adult niece, after my sister died. Lisa is sweet but will never live on her own. my mother in law treats my niece as sub human. I don't know what to do.. anyone else gone through this?