Working full time, married with three kids. I know this well. I've had a business acquired, write blog posts, writing a book series, have taught courses and more....by far the most common question is "How do you do that?"
For me, it really is as simple as....I just go to work hours early to work on those things, because I enjoy them. When I get home, I'm just a dad and a husband.
I’ll read and upvote your take on this rather than OPs, because your story is closer to the reality for most people. No offence to OP but when you’ve no kids, mortgage and household responsibilities, it’s not that hard to do a side hustle.
Were the parent's activities "side hustles" or were they his main hustle for various intervals? It's a little unclear. In either case, those side-hustles seem pretty lucrative--it's harder IMO when your side-hustle is just for fun.
For me, it really is as simple as....I just go to work hours early to work on those things, because I enjoy them. When I get home, I'm just a dad and a husband.