Good crew, bad crew ? or Good Skipper Bad Skipper ?
Maybe you need to give yourself a good looking at. I wonder whether or not your family's failure to take any of this in might indicate that you are rubbish as a teacher. Fine, you get a bunch of good old boys who may not know much about sailing but have a good understanding of lines etc and all goes well but when you are left with a totally inexperienced crew you fail to get your message through.
Maybe, if they are still interested in sailing, you should send your wife and kids off to a sailing school.
(I say all that, not to be spiteful but as someone who was utterly apalling in my ability to get the message through to my crew. I am in no way suggesting I'm now perfect but I do hope that realising at least some of my faults has meant an improvement in my performance over time. )