The thing about Scott and Nathan that will always be funny to me is that ultimately the whole "losing your child at a young age and not meeting them again until they're adults" is not a terribly rare beat in comics.
It's, in fact, incredibly common. Logan's got that beat with Akihiro. Raven's got it with Kurt. Xavier with David...maybe, to be honest, I've never been sure when Xavier first became aware of David's existence. I'll have to track down those comics.
Hell, Magneto managed to RAISE his kids and only learn they're actually his kids after they reach adulthood. Whereupon they became not his kids. Sort of. But then he got another adult kid. Whatever.
The thing that's funny about Scott though is that he goes through that plot beat, has the requisite angst about not being able to raise his kid and missing out on most of his childhood, and then promptly decides "okay, well, I'm going to keep raising this fifty year old man anyway."
It's subtly different from the other examples, I think. Akihiro was willing to acknowledge Logan as his father, but they were enemies for a long time. And while there is some cautious acceptance now, they're still not really a traditional father-and-son. Kurt acknowledges Raven and even tries to support her at times, but Raven's not the most maternal at the best of times. The less said about Xavier's fuck ups the better.
The hilarious thing about Scott and Nathan is that they actually do act like father and son. And eventually, that starts to make sense. Scott and Jean did, after all, raise Nathan for the first ten years of his life, albeit under pseudonyms and in borrowed bodies. And then, much later, they got to raise him for maybe a year more on Krakoa?
But those are things that get established later on. And Nathan's spent like thirty-to-forty years after that basically on his own. But for whatever reason, he sees this perpetually twenty-something dude insist on acting like his dad, and inviting him to family dinner and giving him Christmas presents and shit like that, and just kind of goes "yeah, okay. You're my dad now."
And it even extends to Rachel and Nate Grey. Because really, Rachel isn't their daughter. She's the daughter of a long dead alternate future version of Scott and Jean. She's under no obligation to go along with Scott's awkward attempts at fatherhood. And he really has no business trying to be a dad to someone who at various times is either his own age (circa X-Factor) or only a few years younger (current interpretation.) But nope, Rachel's their daughter. And she goes along with it, even when she's mad at him during the Emma years.
Nate Grey is even more bizarre, since he's Sinister's test tube baby from a parallel universe where Scott and Jean didn't even meet until adulthood. (Though it did seem like they might be getting somewhere toward the end.) But he's invited to family dinner too. And while he's not specifically named, I think it's important to note that there are THREE rooms in the kids' section of the Summer House. Not two.
Room number 17 is listed as "empty". But Scott's an organized sort of guy, if he built three rooms in the kids' section, then he meant three rooms.
(Also notice that there's an empty room in the brothers' section too. Maybe if Adam-X wasn't busy in the Mojo-verse, he'd have had a place to stay too?)
It's just funny to me. Other characters meet their kids as adults and are like "okay, well, we've missed so much time and opportunity, we'll have to cautiously find our way forward as adults". Scott Summers is like "Okay, well, you're my kids, so dinner's at six, bedtime's at eleven, and we'll talk about your homework later."