DD is in year 3. In year 1 she had a few issues with another girl where DD hit the other girl a handful of times. School phoned me, we dealt with it and asked to be kept informed if it happened again. Nothing ever came of it and as far as we know both girls are now friendly enough. The other girl's parents will not speak to me. They won't acknowledge me or DD to the point that if I hold a door open for them they refuse to take it. I have given up making any kind of effort with them. Fast forward 2 years DD is having a bday party and invited all the girls in her class including the one mentioned above. She handed the invite back to my DD and told her she wants to come it her parents don't like my DD so she's not coming. I've also found out from the class teacher that they still phone the school every few weeks to check that my DD is behaving. Now I fully appreciate that my DD was in the wrong in this original situation but it was dealt with 2 years ago and they were 5 at the time. Yet the parents obviously still have a major problem with us. Should I speak to the HT about this? And what can I reasonably expect him to do about it?