Another vote for answering fully and honestly, but one thing I'd like to emphasise: I think it's helpful to tell them where his ZPD is, i.e. which things can he do with support but not yet alone? For one thing, this is where they should be teaching him; for another, it lets them know that you are capable of noticing what he can't do, and lets you show them that you're comfortable with him not being able to do things yet. Sometimes I have the impression with the pushy parents (you know, "them", not "us" :-) that they only want to see the amazing things their children can do and want to deny that there are things their children are in the process of learning and other things they're not yet ready to learn. I dare say teachers have seen this too :-)
