It might not be the best way to live, but it's a great way to die!
Give em a break. Most people posting have never been on a sailboat. We own a 40 ft Yorktown that we spend a ton of time on. I know of many babies, cats, and dogs that have been raised on boats. The kids seem to be part dolphin and are surfing by age 3 or 4 it seems.
I don’t know anything about this couple but know many cruising families that have done quite well.