Trish, I'm glad your adventure ended safely for y'all.
One thing to take note of: that storm Saturday Morning literally BLEW UP in place. It wasn't tracked on any weather radar, it didn't move in from somewhere else, it HAPPENED right overhead. BAM! Birth of a storm.
I was working at Mt Washington that day, and we started EARLY for the bike race. MW summit was in the clear at 6 AM, and stayed in the clear for some time. The Top Notch ( elite group) start was 8:40 AM and the first finisher's time was 54 minutes 57 seconds, and he finished in clear weather/sunshine with no precip. So make that just about 9:30....... still in the clear looking like nice day.
By 9:45 summit race- support staff was reporting pelting rain, 5 minutes later that was pelting rain mixed with hail, and by 10:05 AM Road Crew was reporting full-on pea sized hail, no rain, with rapid ground coverage above 5000'. At the base we were just beginning to see the big raindrops that foretell "dumpage".
Auto Road Base was monitoring 3 weather radar views and in contact with MWOBS, and the only testimony to local bad weather was < in person witness accounts>. Nothing showed, anywhere, unless you were standing in it.
I made a comment to a co-worker about the sudden, severe hail at the summit, something to the effect of " OHHH s*it, that kind of upper level convection this early in the morning, it is gonna get noisy, REAL fast". Next thing we knew, lightning was striking close by, and we wound up getting roundly pasted by something that just birthed itself over our heads. Your heads just were included by proximity.
What is my point?
Saturday morning's storm exactly profiled the capriciousness of mountain weather. That IS the kind of weather that is dangerous, you can't see it coming or track its route. It happens. On TOP of you~!
I hope you and the kids don't dwell on the scary stuff. I think you handled the situation admirably, and so did they. Alex may have been stressed with Sage while you bolted up-trail and back for the pack, but trust comes from those kinds of situations. Alex gets a huge BIG SISTER star from me for standing tall and being there for Sage while you went back up.
I know your family dynamics are being sifted and remixed in light of the hike. It is a good thing to exemplify learn and change by challenge, but only you can decide if Sage is <ready to learn> or < ready for challenge>.