Allowing a criminal to live in your house puts the whole family at risk. What if he does something that prompts the police to SWAT him, and by extension you? And then there is asset forfeiture; people have lost their homes because their adult child that lived with them got busted with drugs.

If I had a family member that was up to that kind of shit, I might help them pay rent in a home of their own, but they would not be staying in my home.