I didn't have a good relationship with my dad , so we almost never spent time together, and I never saw him fully naked. But a couple of times I managed to spy through a crack in the door as he masturbated, although, unfortunately, the angle wasn't the best so I couldn't see his dick. So my youthful curiosity to compare mine and my dad's was never realised.
But we have become closer over the years, even though we live in different countries now. And we plan to meet and do a tour of the country by car, visit lakes and saunas, have a drink at a bar... catch up on what we missed. So everything can still happen