All's well. We (Central Washington Mountain Rescue) got called off before we ever left town. The NPS folks at White Pass, in conjunction with some of the Yakima County SAR Snowmobile Team members, found them and brought them out around midnight Christmas Eve/very early Christmas morning. We weren't supposed to leave until 4 hours later, so it was ultimately a "no go" for CWMR. I was able to spend Christmas with the fam after all.
The one kid is much worse off then the papers made him out to be. He was found in/near a creek, without his boots, and very nearly in end-stage hypothermia. I hope he turns out OK.
We didn't have to do anything, but thanks for all the well wishes anyway, folks!