Ouch. Sorry to hear this, and it's worse that is family. I would press charges against him for the theft - while it sucks, he did the wrong thing and needs punishing. It may also help serve as a wake-up call that just because you are family, it doesn't mean he can get away with stunts like this. I would also be filing a small claims case for reimbursement of stolen property. It doesn't get it back, but will mean you can replace it.