Sounds pretty marginal for the friend. A 35-40 bag and he might have temps, what, sometimes in the low 20s or down to zero if the freakishy cold/snowy weather continues? He is going to be cold depending on what clothes he has to add to the bag and how dry they are capable of staying as they slog through the high elevation deep snow.
For the grandson, what is he going to use under his legs, some extra clothing or a maybe his pack? But it sounds like he is in survival range, again depending on the pad thickness, clothing, etc.
Are they capable of bailing out when things go to crap? That seems the main thing to me. If they know enough to handle that, then they may get a few bone chilling nights with little sleep. Then abandon ship, lessons learned.
Do they know the hot water bottle trick? Some folks just can't listen to advice, they can only learn from experience. As long as they know to, and are capable of, getting out of Dodge if needed, then I wouldn't worry too much about it. A couple of cold wet nights can be excellent teachers, as long as you feel confident in their ability to at least survive and abandon ship if needed.
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