Most places are good for kids menus, if yours will have pasta bolognaise, steak hache with chips or a pizza you’re fine anywhere! The issue is more that the restaurants can be quite pricey (60 euro lasagna at Gigi’s anyone?!).
Love the Folie Deuce for atmosphere, my kids think it’s the best place ever! Go early before the real party kicks off if you want the self serve. If ski school timings dictate it has to be later then book for their restaurants, either Cucucina (Italian) or the Fruitere (French but they do a really good burger for fussier ones!).
At the bottom of the Pistes L’Etincelle is reasonable (for Val) and good food, safe kids options. Solstice at the Yule has a great terrace, food is good and varied (pasta, pizza chips options for kids) and there’s usually a guy that makes balloon animals for tips! Lulu in the Airelles hotel is really nice, again great terrace, Italian-ish food. The Grande Ourse is part of the same hotel, more traditional and a bit cheaper, stuff like tartiflette for adults and kids can definitely get a steak hache frites.
For dinners, we don’t do that many of, but we like out the Rotisserie restaurant at the Balme de L’Ours hotel. Nice food, standard kids menu stuff and an amazing desert buffet! Fondue factory I haven’t been to in years but I remember it being good. Petit Danois is really good fun but it’s also grim AF, I wouldn’t take my kids in there.