When our kids were toddlers, I invited them over for Christmas and pulled out all the stops (they routinely spent Christmas at the home of Christian friends). I decorated the house to the hilt, made every dish from scratch for Christmas lunch, and was as gracious as any Southern belle could be. On her way out the door, my mother-in-law declared, “It was all too much, too much. Never again!”

Look, if someone tells you that they don't celebrate/observe Christmas,

the solution is not to Christmas Harder At Them.

I wonder if LW could have had a better relationship with MIL if instead of Christmassing at her

she had instead asked her husband to facilitate husband/LW/their kids attending MIL's Passover.