I would only go after family members who knew or should have known what they were up to and did not report it. A crime of negligence rather than commission.
Two brothers were suicide bombers in the Brussels attacks. I would be interested in the family's reaction. If they are in mourning, I might go easy on them. If they are out celebrating, I think they need to have their navels pierced - with a coal mining machine:
This one will do.
Maybe stupidity just runs in their family.
nacl