So sorry to hear. We expect to be ripped off by strangers but your home and family should be a safe zone. It sucks when that's not the case.
My parents let my addict brother in the house but dont give him money or a place to stay or anything. They insist that that isn't enabling. I disagree. I've been talking with them a while now trying to get them to realize that him being allowed to visit with the family and see the babies and have meals whenever he wants IS enabling.
Maybe im wrong on this, others should have a better idea. But seeing as he was caught stealing, I'd say you have more of a reason to ban him from your house entirely.