Impressive that the family survived so long....what happened the horses?
I think it's amazing the husband, wife and child lived as long as they did considering the boy wasn't born before the event occurred and he was something like 5 or 6 by the time we see them on the road so somehow they found enough food to live all those years.
Since nobody knew or planned for these disasters it is unlikely they had huge stockpiles of food stored up. Most people don't have more than a few MONTHS worth of food in their homes at any time let alone several YEARS.
I did wonder what happened to those horses we saw in the opening scene though. Anybody think they butchered and ate them? I don't believe there was anything about that in the book.
I know some people say they think the disaster was an asteroid hitting the Earth but how would that explain the EMP? The Electro Magnetic Pulse which destroyed all the computers and electronics? Remember all the clocks stopped working at the same time. Unless there was some kind of pulse weapon there would still be some machines on batteries or backup generators still operating if it was just a crashing of the power grid, if an asteroid could even cause that to happen.