Lost One, right on! Tolkien used many of the obscurer medieval legends in his mythos, and I daresay that the fairy-ancestress theme appears more than once. Don't forget, one of the ancestors of the Tooks was said to have taken a fairy wife, in The Hobbit, which would explain the love for adventure, in that adventuresome family.
I don't think that we can use any Role-Playing Games as definitive sources, because they have a history of making things up. Mithrellas' children couldn't possibly have received the "Choice of the Half-elven" because only Earendil's children were given that choice, because of their parents' great deed (sailing to Valinor). All other children of half-elven unions would be mortal, according to Iluvatar.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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