Ren

" Lately I have been telling him that it is my job to keep this family safe and if he's not going to help me do that than he's going to need to leave the room or find a
different activity elsewhere."

I do the same thing.
Depending on the age of the child, I might ask them to find another space to be in (if they've ignored my requests to quit) or I simply take that person in another room with me and try to find a distraction, or have a conversation about how I can help them get into a good place (or at least quit trying to bring everyone else into a bad place!).

Ren

Learn about unschooling at:
http://groups.yahoo.com/group/unschoolingbasics/