Shoot me an email and I'll help make you a list. That's right about the coldest time of year, so you'll want to pack warm.

For kids, I prefer ski bibs to ski pants. Much warmer. You'll want to get some good goretex or waterproof gloves and glove liners along with neck/face gaiters to block wind/cold on their faces. Knit hats for when not skiing. Helmets will keep their head warm during skiing (you can rent helmet from ski shop).

You'll need to buy the following:

ski socks (smart wool or darn tough) (don't skimp here)
thermal base layers (smart wool or hot chilis again don't skimp here)
ski bibs - 2L or 3 L preferably or but goretex or similar at minimum.
Ski gloves & liners (I prefer mittens for kids + makes hand warmers in the gloves way easier)
Neck warmer / face gaiter (my kids prefer 2 thin gaiters that they can layer over a heavy single that doesn't breath well)
Ski goggles
Ski jacket
Hot Hands to put inside their gloves (hot hands toes if you want to be able to stick the heater to the inside of the glove (the toes come with adhesive)

The key to shoes is going to be waterproofing. If you're walking through snow, there's no real way around getting your feet moist unless you're wearing waterproof boots. They make tons for kids that aren't expensive so I'd look at sun and ski etc. the key is making sure you waterproof them.

Hands, toes, and head are the places you lose heat so keeping those warm will pay huge dividends everywhere else.

One last thing: NEVER put the Hot Hands Toes on the bottom of the ski boot or shoe. ALWAYS put them stuck to the top of the shoe in the toe bed. If you put them on the bottom you can burn your toes VERY badly and create a crazy surface for your arch that you'll feel big time later and make sure where your base layers meet your socks is flush and not bumpy or your shin will hate you)

If you have any questions about brand quality etc feel free to ask.

My kids prefer to wear a single thermal base layer under their bibs (one likes sweatpants the others smartwool), they usually wear multiple top layers (smartwool thermal, bigger sized smart wool thermal or hoodie, and then ski jacket), glove liners, gloves, gaiters, goggles and helmet, Nothing too crazy.

At 3, they're probs going to be mostly magic carpet (mom and dad can stand at the bottom and cheer them on - and have snacks / hot chocolate for in between runs )

At 6 there probs going to be mostly magic carpet to start but may get up on the bunny hill a little to practice pizza and French fries.

just a little note: your kids will be hearing pizza and French fries all during their lesson - I might suggest bringing comfy shoes and grabbing some pizza and french fries and maybe even ice cream when theyre done. A) it puts something warm in their bellys and B it helps them teach you about what they learned in class which helps embody the cognition C) it gives them something to look forward to the next day. little operant conditioning.

Plus, if you go to Pizza on the Run, its almost next to impossible for my Sumco homies not to be working and if you politely let them know that panda says they are terrible skiers and listen to terrible music and that he hates them with all of his heart, there's a good good chance they will give you free food and drinks. Same for the bowling alley.

If you need help w the rentals, we have 3 shops in Breck. Since it's only kids gear, if you don't mind picking up from Breck, I can probs get you a friends and family discount (50% off but I may be able to get it comped since it's 2 sets of kids gear).

On another note: Woke up to a pleasant little snow storm this morning in Glenwood. Expected to continue through the day and into the night/Monday morning. Looks like about 6 inches and coming down pretty good at Snowmass. Maybe we can push another couple of inches today and another couple tonight/tomorrow. Then snow potentially Thursday - Saturday. Vail is getting it pretty good too. Summit doesn't look like they're getting hit nearly as hard.

Dude thanks, this is so helpful.