I'm trying to determine the best and fastest way to set up

I'm trying to determine the best and fastest way to set up a forum. Under the oppencas.ca domain I would like there to be two groups.. one for parents and one for professionals so that parents can talk to parents and professionals with professionals but I don't want them to see what each other is talking about (the two different groups). Is there a way to quickly and easily set this up? Buddypress feels like it's too much for what I want these two groups to be able to do. Feedback is greatly appreciated... this site is to help another friend out and not a client site so I'm trying to keep my own time investment down on this one.