I posted before about my grandfather being confused and delusional, and being afraid of seeing a doctor. His son (my uncle) has a violent past, alcoholism, drug abuse, and is a physically intimidating man. He threatens to kill himself if my grandfather doesn't give him money. He calls him "worthless" and screams at him so loudly that the neighbours several houses down have heard him.
He lives with my grandparents, so I'm scared if I report it that he might hurt them. I'm also scared if he knows I reported him, he'll hurt me. I live in Canada and the laws aren't very helpful here. If he was in the act of physically hurting someone and was caught they could charge him with something, otherwise they would likely show up, tell him someone reported him, then leave. I don't know what to do. I want to help my grandfather but me, his other children, and his siblings are all scared of his son.