Whoa tiger. Pretty much the only alps places I’ve ridden with the family are tignes and Saalbach…..
Saalbach has ( or had when we went 4 years ago) around 8 downhill routes. We did about 3 of them endlessly with a the kids on 20″ and 24″ islabike. Had a great time but were fully aware of the limitations of the place. There are supposedly about 500km of xc runs, BUT THEY ARE DIRE FIRE ROADS FROM HELL. I can’t emphasise enough how shockingly bad they were. I remember arguing with some bloke about how the fire road with concrete delivery trucks zooming up it could not possibly be the classic red xc route. But it was.
I did a few of the other downhill runs sans kids, but not really my thing. Basically the only choice was full suss gnarl or fire road hell. Nothing in between.
Tignes on the other hand rocked completely. Just amazing. Fair enough, the kids were now on 24″ and 26″ wheels but even discounting that it wad brilliant. Amazing routes from green to red, and beyond. And then the amazing enduro routes.
No idea if you’re looking for family riding, or how good they are, but if they are half decent then go to Tignes.