Hee Hee.

I know what you mean, Jereboam. But you have to let the youngsters
make their own mistakes and learn from their experiences.
To us Grumpy old Gits, stuff looks kind of obvious when we're
looking through the rear view mirror with hindsight and experience.
But you have to remember that the youngsters are peering forward
through a grimy windscreen where the washers don't work.

How does the old saying go? Something like:
"He who does not learn from his mistakes is destined to repeat them."
If they keep making the same mistakes, or said son in law starts
to exhibit a flat forehead from continually banging it against the
same bit of wall, then, maybe, it'll be time to start stepping in.
Let 'em make their mistakes. It's part of life. Just be there, with a nice
avuncular type attitude, to pick up the pieces and to sometimes
offer offer a bit of advice.
Just don't expect any thanks. Nobody likes a smart **se.
