The thing is, you almost never see the parents you need to see. I do recall last year when one mother did turn up and I supplied her with a box of tissues as she heard from her daughter's teachers what the problems were.
The other night, we had interim report parent-teacher interviews. This works as follows: all the class's teachers have to tick boxes to say whether or not the student is up to date, is doing everything they should be doing, is co-operative, etc. Any student who gets more than a certain number of "no" responses or "sometimes" is asked to come in. Most of my class got those messages. The ones who really needed to come in, didn't, as usual - which, I guess, is why the kids are the way they are.
On the other end, I had a visit from a student and parent who didn't have to come. The boy's father suggested that maybe he needed something more challenging - and I told him, to his surprise, that his son had had the chance to do this in a recent assignment that was designed to give all students an opportunity to work at their own level, but had chosen the easier options!
It should be interesting to see what happens next time i hand out an assignment.