Although not exactly a Christmas tradition it is a tradition that happens whenever my grandchildren are all gathered in the same place. I try to take a few photos of Mason and Isaac together so that I have a photo for the calendars I make each year. These two were born in June, so it will be this photo that I use for this year's June calendar page.
I used Palvinka Designs - On Chalkboard: All Boy Collection
https://www.oscraps.com/shop/On-Chalkboard-All-Boy-Collection.html