My oldest niece LITERALLY told my mom she wanted a Switch for Christmas and my youngest niece literally got excited when she accidentally overheard me running the idea of possibly getting a Switch. Also last year she got excited when I got her and her sister a Sega Genesis Mini, at first because she thought it could run Fortnite (which is on the Switch) and then a few days later told me how much she enjoyed it and how Sonic was her favorite.
My only concern is the boys, since they'd probably be upset if they don't get Switches of their own and if they did get Switches they'd break them. At least with the one-year-olds they wouldn't even notice… unless I get them each a giant teddy bear. Definitely a step up from a Pikachu plush with a Santa hat.