When I was a kid, as part of non-Christendom, I had to be instructed by parents to no ruin if for younger Christian relatives. For the most part, I did a good job. The memories of the family Christmas party is a bit sepia toned. It was always warm, so many people, me just eating and eating, then hanging with cousins.
I think some of the shine started coming off when I was closing in on awkward teens, less able to interact well. I wonder what they would've been like as an adult. But alas, that tradition faded in some ways. Parents got older, kids moved away, some other family dynamics shifted.
On another note, there's almost a part of me that wants to talk about the nomenclature that makes the thread title, but that's a last week thing. No sense digging in this close to the holiday.