Failing that, really call the police on them.
" your eldest daughter called us. you are under arrest for the federal crime of revealing others personal mail. you have the right to remain silent. if you give up t hat right, anything you say can and will be used against you in the court of law. you have the right to a..."
that will scare them shitless.
Um, move out with a friend.
I dont trust any of my friends to make rent on time.