After you tell 'em fuck off and die,

Change your phone - get unlisted (so they can't call). Get new email addy (so they can't email). And any snail mail that arrives from the offending party get stamped "refused" and returned.

Break off ALL contact. They sure as hell ain't family. No need to for you to put up with them.

What ever the "solution" is that is being suggested, reject. It sounds more like a prison sentence.