threats against an abuser are illegal and considered harrassment. Yes I know abusers use threats all the time to control their victims, but it wasn't right for them to do it, doing it back doesn't make it right either.

Also telling him you know what he did to the cousin may put the cousin in a hard spot or worse danger.

Let your cousin deal with what happened to that cousin and you take care of what happened to you. That is the only way it can be done.

Think of it this way would you like the cousin to threaten your abuser and the abuser come back on you for her actions and your telling the cousin what happened?

The only way you can make sure he has a less of a chance to hurt others is by confronting him on what he did to you and keeping the confrontation on your abuse and only your abuse and disclosing what he did to you and keeping those disclosures to others on information about the abuse on you and only on that abuse that happened to you.

Surprising someone that has been abused by disclosing their abuse and abuser will only lead to that abused person denying what you are saying and everyone will see you as a trouble maker instead of someone trying to help that other person.

again let cousin take care of cousin and you take care of you Thats the only way you will come out on top during confrontation and disclosure, (after a most likely rough beginning while everyone gets used to the fact that you are no longer going to keep quiet about what happened to you.)