Not sure how to deal with 86-year-old Mom who's angry, resentful and threatening to hit my daughter and me.

Blames us for her pain. All she talks about is how much pain she's in. That she wants to die because we make her life miserable. All my daughter does is work. She yells and screams at me. I help her do everything she needs. She won't eat anything we prepare. She'll go without eating, then put blame on us. Ever since one of older brothers passed, she's just miserable and takes it out on us. Wishes death on us daily.