there was a parents in my son’s class group who didn’t come to my son’s birthday party last year . We are very nice to them , have helped each other few times , and have always treated their son nicely . I missed his son’s last part because of timing misunderstanding but did deliver his gift thinking the little one will be happy . My son plays with their son too . This year , they are again avoiding to come to my son’s birthday party. They went to all other birthday parties . This has made me think whether they are deliberating avoiding us based on our social class / financial status ? We are renting in a rich area where they own a house , and most of the other parents do but I can’t come up with any reason in my mind other than thin as to why they will avoid my son’s party ?