I am not sick very often. In fact, except for yesterday, I have not been sick all year (sound of me knocking on wood).
But yesterday, I contracted a stomach virus that hit me pretty hard and got me thinking. Yesterday, I left work early, went home, poked up the fire, and laid down on the sofa and watched my big screen and recouped. It's really gonna suck getting sick during a WROL scenario. There won't be any downtime. Up-time will need to be very near 100%, at least in the short term and intermediate term.
This is one of the reasons where a medium to large group will be best. If I am down, someone else can step up to fill in the gap and vice versa. If its only a single family, there is no one else since everyone else will be utilized at close to 100% anyway.
Would be best to get your group squared away early.