On your Scion verse--- what do you think the Feanorians' reactions/interactions would be like with their new nephew/grandson/son?
Feanor is thrilled. Absolutely thrilled. He wanted forty-nine grandchildren, and he is now one closer to that goal! (Gil-Galad, for his part, is just. Still bewildered at being so wanted. Has anyone warned Feanor they're not 100% sure on this? He does NOT want to deal with a disappointed Feanor . . . and Feanor has apparently declared no take backs. If it turns out Caranthir's kid is actually someone else then Feanor is claiming that kid AND Gil-Galad. Two grandkids closer to the goal!)
Nerdanel had slightly less heads up than everyone else, so she's a bit more bewildered. Gil-Galad sympathizes with this. She has a dearth of statues of him and decides she needs to fix this posthaste. Gil-Galad assures her she does not. Gil-Galad is not going to win this one.
(Gil-Galad has seen statues of himself as king before. He has not seen a statue of himself as a small child before. His parents are extremely attached to it. He feels - extremely strange looking at it. It was crafted from his own memory and yet - surely he was never really that small.)
(He wonders if he can convince Nerdanel to make statues of some of the other children of the band of mortals that took him in.)
(Nerdanel is already diving headfirst into this new project.)
The uncles are the awkward part.
Celegorm and Curufin actually met him is the thing. They feel like they should have known somehow, as opposed to running a private betting pool on which of their cousins was responsible for him. They were also responsible for the Finrod Debacle which Gil-Galad has a lot of Feelings about.
(For Gil-Galad's part: Finrod took him in, and they betrayed him - in the middle of which, Gil-Galad was of course conning him - and them, technically - and it's not as if he went with Finrod, and he should have, he knows he should have - )
I think that one takes time to sort out. Once things get settled between Celegorm, Curufin, and Finrod, it's easier for Gil-Galad to feel he has a right to sort things out too.
Celebrimbor is awkward for different but not totally unrelated reasons: Gil-Galad spent a lot of time avoiding him in Nargothrond because people kept thinking of them as peers and throwing them together, and Gil-Galad was desperately trying to be alone as much as possible because when he was alone he couldn't accidentally give himself away and get kicked out/executed.
Celebrimbor, knowing none of that, came to the understandable conclusion that Gil-Galad didn't like him.
None of this was improved by Gil-Galad's subsequent guilt spiral over taking charge of the Nargothrond survivors/taking the throne. (He did delegate as much as he could to Celebrimbor! He assumed Celebrimbor knew what he was doing!)
Celebrimbor came to the conclusion that it wasn't that Gil-Galad didn't trust him as a Feanorian on a political level; it was just that Gil-Galad didn't like him, personally.
That one is a lot easier to sort out.
Maedhros, Maglor, and the Ambarussa have a different set of issues: Namely, the memory of all those conversations pre-Sirion where they discussed what to do if Gil-Galad showed up in time to interfere.
Prior to Doriath, there was an unspoken but very clear understanding that if Celebrimbor happened to be there for some insane reason then he was, of course, NOT to be killed.
After Doriath, there was a very clear and very spoken understanding of of this, because after Elured and Elurin, Maedhros is making no assumptions about anyone's unspoken understandings of anything.
But there wasn't an agreement like that about Gil-Galad. Because they didn't know.
So that's . . . painful. And then there's the added pain of - nothing's really changed. He was GIl-Galad then. He's Gil-Galad now. It's just the perspective that's shifted.
Which - might actually be good for them, in the long run, because -
Okay, look, in this AU, Gil-Galad grows up in a very us vs. them mentality, where everyone who is part of the us deserves to be protected and looked after, and everyone else is fair game. It's us vs. the world, and we do what it takes to survive.
And then he's the only one left that's part of the us.
But he can't live like that, where he's the only person who matters and there's no one else he's trying to protect and no one else he can rely on. He won't live like that.
But everyone else he meets, he's conning, he's lying to them constantly and getting all kinds of benefits because of it, so he's treating them as if they're not "one of us" but -
But he's living amongst them, and liking most of them, and they're certainly treating him like he's part of their group, especially Finrod -
And the guilt just gets worse and worse until Nargothrond falls, and suddenly he's taking responsibility for everyone. He's taking care of them, and the number of responsibilities and people attached to them just keep growing, and he takes that seriously.
So the definition of us and them gets ever more complicated until eventually, there's no clear line at all anymore. He's got the people he feels more responsible for, but now - even while he's still lying, there's no one he feels he has a right to lie to.
So to loop this back to his uncles -
I think the Feanorians have some of that us vs. them mentality going too. And in their case I think it's reinforced by their Oath and its consequences - they feel they have a right to do these things because the worst that can happen to anyone else is at least temporary (after all, they're elves; even death is temporary); they're staring down everlasting consequences.
So finding out that Gil-Galad was secretly one of Us all along might help them break down some of those ways of thinking too.
The good news is, they have time and peace to heal all that in now. And they will, eventually.