I suppose it depends on the relationship you have with that family. There are numerous reasons as to why someone may omit your child from a birthday party. The family could have financial limitations, space limitations or could have just plain forgot to include your child. If you do ask "why," be prepared to accept the reason without judgment. Party on!
What do you want the panelists to weigh in on? Email your ideas to editor Tamara O'Shaughnessy at firstname.lastname@example.org.