What would you do if a family member tried to murder you but you can't go to the police because they were abused as a child and you saw this happen?

i have this family member who tried to kill me and i know their abuser. the abuser is an old lady who never admits her mistakes and is extremely self centered but she is old so when i tell her the truth she makes it look like i am abusing her. this poor person had the worst chilhood and is extremely narcistic he has been in prison twice. i know for a fact he tried to kill me. i am worried he might become a serial killer. but considering what those two old ladies did to him i dont have the heart to be mad at him.

What would you do if a family member tried to murder you but you can't go to the police because they were abused as a child and you saw this happen?
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