That is a fascinating data point.
I think there is something inherently difficult about the second generation running the family business. That rarely works. It’d be interesting to study the “why” of that. I’m thinking that the first generation in your cases was probably aware of that trend...so they thought that having the son get the MBA was a good way to start to make sure that their Empire didn’t crumble.
And look what happened.
Probably it would have been better to start the son in the mail room, and let him work his way up to ownership. Now that might actually work....
It's not that difficult.
The son spent the previous 6 or 7 years learning "business" instead of "the business".