Missing for this long bodes ill for them all. Bad weather on top of it adds more hopelessness to the mix. It would be a real miracle if they are not dead.
Prayers.
Yeah, I can't say this sounds too good. If they'd gone on a hiking trip or something, I could understand them being gone for 4 1/2 days if they were lost. But if they took their 4-year-old and 7-month-old with them, I'm guessing they were just doing a standard family drive, and probably didn't have more than a few hours' worth of food with them. :(