To celebrate, I'm going to take a look at how another TV-show played out the idea of sons having differing ideas of following their father's orders/legacy, and how a death in the family impacted those dynamics.
Because I can
Sam and Dean Winchester on
Supernatural
Dean, the older brother, is portrayed as the obedient son who has a bit of hero-worship for his father. Sam, his younger brother, is much more likely to question and fight with their father. We are introduced to them when Sam is 22 and Dean is 26; they're young adults, and neither of them has been living or working with their dad for some time (though more recently in Dean's case).
In this scene, it's been 6 months since they've heard from their dad, and he contacted them with information he wants them to follow up on.
When they do reunite, Sam continues to fight with their Dad, leaving Dean in the unenviable position of playing referee.
Then...things change. Their Dad dies. More specifically, he dies so that Dean can live. And one of the last things Sam ever said to him was an accusation that he didn't care about Dean. Naturally, they are both a bit messed up by this, but their attitudes switch. Sam tries to become the dutiful son, honoring his father's memory. Dean...starts to express his anger and rails against the man now that he's not there any more.
Sam does get a chance to reconcile with his father, through the wonders of time travel. Of course, his father doesn't *know* he's his father, as this scene happens before Sam's birth, but irony aside, we can see that Sam's attitude has definitely shifted.
Dean...never really gets the chance to resolve his side of things. Years later, we can see it underlying some of the things he says. Which might seem odd, because superficially, he had a chance to say goodbye to his father, while Sam did not, and fewer regrets about his relationship with his dad. But...their dad kinda screwed up that goodbye.
This scene happens 10 years after his father's death:
Obviously, I'm not suggesting we do the same thing or make a direct parallel or anything like that. Some of the only similarities between John Winchester and Fëanor are the obsession and larger-than-life persona. Nor do I think that Amrod and Amras' views are parallel to Sam and Dean's. Also, Sam and Dean are the main characters of their show. They have significant screen time in every single episode. So, the opportunities to tell that story are much more varied than we will have with the limited screentime we can devote to Amras moving forward.
We are making Amrod question the Oath, question the quest for revenge, question the decision to leave their mother behind, question Fëanor's leadership. And of course Amras disagrees with him, defending all of those things, and toeing the family line.
But then Amrod dies, killed by their father's decision. Suddenly, Amras has a reason to go back on a lot of what he said. Suddenly, Amrod makes a lot of sense. And now he feels the need to speak for Amrod, who can no longer speak. So, he takes on his brother's mantle, and will be the voice opposing the Oath. He's still bound by it, but he now realizes it's evil and will condemn them all. So, I see him as the conscience of the Fëanoreans. Lots of outsiders will condemn them, but other than Amras, they're going to refuse to accept the guilt, or ignore it, or in some other way disregard all of that judgement heaped on them. Their actions are justified in their eyes, so. But Amras will be the one who never falls for that. He doesn't try to justify (because doing that would justify Amrod's murder). He won't have a lot of screen time, but when we do see him, he can articulate these sorts of thoughts about the Oath and the Doom of Mandos and give voice to something that otherwise wouldn't come up internally in the Fëanorean debates.
I think we can work with that. There will likely be places where it will be difficult to make his character work, but I think we can do some interesting things with him, showing him go on.