I guess it depends on the type of parent your room mate is, and how badly you want her to stay your room mate. If she's the type that thinks her child can do no wrong, well then I don't think that there is much that you can do here besides say "stop hitting". But if she's a better parent than that, tell her what's going on and tell her that when you see him hitting, you will be saying something to him. Sometimes just the shock of hearing NO from another adult shocks them enough, but probably not in this case.
at 10:08 AM on Oct. 29, 2008