I can't help but echo Ryan's comment. This pretty much helped nothing, but only left his family behind - and goes to Darwin Awards in my books.
Being unprepared and unaccustomed to cold is pretty much a recipe for a disaster when trying to overnight if you have snow on the ground, no matter how good the intentions behind it.
Yes it is possible to overnight outside in temperatures below -15 degrees of Celsius without any fire or heating, but that's only because I happened to have the stuff which can be used to pull it off. I do recall a group of minimalists trying to survive in Lapland (originally from French if I recall), they respected nature up to the point it became dangerous for themselves - they didn't cut the trees down, the pushed it down non-violently. To nobody's surprise, they didn't last even two months out there in the winter, but luckily no-one died. Much of that belongs to an outsider who provided them wood to burn in their tents.