Anonymous wrote:I think you can ask whether it was intentional (it's totally possible that they just recycled addresses from the older son's bar mitzvah when your dd was 2). But when asking, I would assure her that you were just wondering and would totally understand if they were not including younger children at the event.
If it was intentional, I still have to agree with 14:28.
OP here, this did cross my mind. What you said to mention sounds reasonable.
We're not Jewish so I'm not familiar with the customs and norms.
The only Bar Mitzvah I've ever attended in my life was the older son's.
I just know in our culture, you either invite the whole nuclear family or none of them to a similar event. I didn't realize it was often for kids only and not adults.