Son has sent out birthday invites. Turns out that parent of son's best friend doesn't like us and has told other parents that she doesn't like us and no response to invite. We are a perfectly normal family and son is pretty well behaved at school. Always thought she was offish - would always reject eye contact at gate or a friendly hello, but no idea what has caused this dislike and hurt by this. I know I shouldn't be but I also feel sorry for the kids. Should I just ignore? There are 5 coming out of the 6 invited but the vital best mate is missing. Any suggestions gratefully received!