yeah, this. if M-I-L has been disrespectful of simple requests thus far, then have M-I-L's kid (who is presumably still in the picture, if you're spending the holidays with their mom) lay down the law. Otherwise, tell them "no sandboxes or mobile devices", thanks, and let them buy whatever's in the toy aisle at Costco that's shiny. And ffs, get over yourself if it's not just a small veto list. It's reasonable to ban ( screens | noisy toys | misgendering toys | weapons | batteries | Trumpy Bear ), but if grandma buys the kids Barbies or Bratz dolls or puzzles with the world's ugliest picture of dogs playing poker, then suck it up. Your kids will play with worse toys than that before they hit kindergarten.