My grandma wants to put everyone against my dad?

Grandma is 86 yo. My dad is my grandma's son by the way but for some reason seems like she hates him. Their relationship has always been super rocky since forever but recently my grandma just wants to put everyone in our family against my dad who hasn't done anything to her. My mom said my dad has been very sad and depressed these past few days because of my grandma's behavior she talks bad about him to everyone behind his back but instead of saying it to his face she keeps bitching behind his back. She expects her kids to do everything for her and they already do a lot but for her is never enough and she says my dad is bad and mean to her and doesn't do anything for her. She doesn't realize the mean one here it's her for trying to accuse my dad of things he hasn't done to her. It came to a point where my dad wants to leave his country and come stay with me for a while. I'm open to welcome him for a few months but I'm afraid everything's going to be the same once he goes back. Everyone in our family is fed up with lies and manipulation she can be really mean to people and we don't know what to do.

My grandma wants to put everyone against my dad?
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