Originally known as Killer In-Law has Grandma (Nana Visitor) coming to live with her family. Grandma is not the sweet, loving person she's supposed to be, she is psychotic and can snap.
The movie is trash, but it's entertaining trash. Originally a Lifetime movie that we watched on Hulu. Stephen King is quoted as recommending this film. I'm sure he appreciated how unhinged grandma was in this film. She's a callback to King's Annie Wilkes character from Misery, only she's in grandma's skin. I liked it but can't recommend it. Just OK, but it's the good side of OK for horror fans.