"Anyway, her husband came over for the weekly visit last night. She stated that on (JW) TikTok there are talks of them allowing people to celebrate Christmas..."
Suddenly, the possibility that the WT may allow such things makes sense! It allows people like your in-laws to invite estranged or distant family to a family gathering where they can take the hold of the narrative. That makes sense in the broader world, but in America and Canada, Thanksgiving would be the appropriate holiday to commandeer. Bethel could provide the appropriate "discussion" topics at the table and an appropriate form of prayer* before the meal.
* Not Grace; they don't believe in grace π