Good advice from
@marzNC on making sure kids have dry gloves/mittens.
Also, if boots have removable liner, pop them out to dry once in your lodging. Can lay a towel on the floor and rest them on there. Near a heating vent is great or fireplace but not TOO near - you don't want them to melt!
I am short, so most of my "ski pants" are actually hiking or rain pants. I wear either merino wool capris or (in Spring) just typical workout capris under them. But then the pants work great for taking hikes, snowshoeing, etc too.
Maybe assign 1 large bag per family member for everything instead of suitcase+ boot bag? Less to schlep, imo. (I use an inexpensive wheeled duffle.) There is a thread here in the forums where ladies shared their individual ski trip packing strategies.
Re: outerwear
I usually pack my ski outerwear and wear a winter vest (down or polyfill) or heavyweight poncho/ruana wrap on the plane or in the car. That way, as noted by
@Christy , you can let your ski gear dry and still have something for going out for dinner, etc. I also like a lighter outerwear option for travel bc then I don't get overheated and can easily stow it in my backpack if needed. It's easier to drive in a vest, too, imo. Maybe an easily packable fleece, vest, or heavyweight hoodie for the kids for travel?
Here I am after landing at EGE (Vail) in March. I was comfortable in just a down vest while navigating a rather hectic Spring Break day at Ohare, & stowing once aboard. Thin knit hat & gloves tucked into a purse in case it was chilly there.