Up to 12 years ago, I had no worries. Practically lived in a tent doing field work anyway. :)
Now I'm dependent on meds - to stay alive. So, yep, I'd only be good as long as the supply of meds lasts. DS would have the same issues. DH and DD would be in better shape. If they could make it to my parents', they'd be fine.
I'm with Farrar, hoping to be in the city and go down quickly.