You might have your turn come Christmas time. All you have to do is take the children to everything to do with Christmas. Decorate the house for Christmas, and do so to the hilt. Teach the children to sing Christmas carols (and I hope they embarrass the spouse that brings them to the Kingdumb Hell by singing Christmas carols during the boasting sessions). Get them all keyed up with presents and the whole nine yards.
What that will accomplish is hopefully make them appreciate Christmas. I hope they will be ranting about Christmas all through January and February, and that will make the other children jealous. And more of them will start pestering their parents about it next year--and hopefully, they will all stop going to boasting sessions at all.