Tolkien had that concept of Erestor being a half-elven relation of Elrond early on, so I see people speculate on him being Elured or Elurin, because they are the only known misplaced Peredhel.
But another abandoned concept was Elros’s children having the choice of the Peredhel. And his eldest abdicates immediately to continue his work as a scholar. And Rivendell is a place of learning… I’m just saying Erestor could be Elrond’s nephew. Any of them, but I kind of like it being Vardamir Nolimon because of his scholarly bent and abdication.
Also, can we talk about how three generations of this family in a row threw twin Peredhel boys as their first children? It’s weird that that is so prevalent in the line of Luthien, but she herself did not have twins.
Unless she did.
Dior Eluchil arrives at court with a Silmaril as his proof of right to the throne, and a name that means “successor heir-of-Elu.” He then immediately marries a kinswoman of Thingol. It might not be a stretch to assume that they were a little anxious to make his claim on the throne iron-clad, and thus the decision for his twin brother to not show up until he was well established becomes an option. Aaaand then the kinslaying happened and him showing up at all became kinda impossible.
Anyways, shout out to Erestor’s backstory, the under-appreciated cousin of Gil-Galad’s parentage.