Dad1: A hands-on leader/tuner of a one-then-two-then-one car team, struggling for the last couple of years to keep the team going, just lost their major sponsor, looking lately like this whole thing has lost all the fun, with a son having a hard time qualifying from one event to the next...
Dad2: A major business owner with several successful enterprises, including a huge ~10 car/bike operation at the top of the NHRA pile, with sponsors galore, a couple of cars well into the hunt for their respective championships, including a son who is as much a lock for the title as anyone has been in the last decade.
One son walked away (reluctantly, no doubt) at or near the bottom, the other would be walking away at the top... Not impossible, but the situations are so different as to be almost incomparable.