TPR HEARINGS. What will they ask?

I was "prepped" by the children's service lawyer quite extensively in expectation I'd testify. Lots of stuff about his behaviour, both at home and at school, with a real emphasis on improvements since he came into care. And, unfortunately, they wanted me to testify to things he'd said to me. I was quite concerned that that he'd feel his trust had been violated by my passing these things on! His counsellor told me to keep some things back (not lie, of course - but not offer up things the lawyer might not already know) but I didn't want to jeopardize the case, either. I remember asking about that here and getting pretty mixed answers. Anyway, in our case, when we actually got to trial the parents surrendered and I didn't have to testify.