As a parent of teenagers, that alone can cause serious tension on any relationship. All those hormones and moods (and I only have 2 boys), Ughhhh!
First, I would suggest looking for a different counselor, one that doesn't need to be "educated", even if it means driving a ways. Second, maybe it's time to look for a different neighborhood, but still within commuting distance to everyone's current job. Not every neighborhood is the same and you definitely have crappy neighbors. Have the kids visit other schools and find the one they feel the most comfortable in, then find a home in that neighborhood.
What suggestions has Brian and Liz come up with or do they just get defensive when everyone else wants to throw in the towel and "go home"? It may appear to them that everyone else has already given up.