The "Fathers and Sons" tournament is very similar to the "Candidates vs. Masters" tournament that was practiced in Soviet chess. As far as I remember, the main drawback of such a competition was the lack of sporting interest among the masters. That is, the candidates fought with all their might, earning master points, while the masters only had to score a certain number of points to avoid a "failure." As a result, masters soon stopped participating in these competitions. I'm afraid the same will happen here, although it starts with good intentions...
A 2x2 match is certainly long; just look at the number of posts in the corresponding thread "let's agree to play with 3 or more players." But if the primary goal is educational, you can arrange a match on a template with computer opponents. The maestro and the novice will play as allies. And the beginner will see how to play (at least at the beginning of the game) and try to repeat it himself (receiving comments from the master in the chat). But this is no longer a tournament; it's a training session.
I was very positive about asm's idea (a game with an open map for one of the players) until I remembered that A. Nobel invented dynamite to help people remove stumps from the ground. And what was the result?
PS In the first online games, there was a constant temptation to reveal the map, but somehow I resisted and now I don't even remember it, and here is the temptation again.