Well, if they are humanoid, then the only sisters that existed during that time period are Valier and Finwe's two daughters. And there aren't many sister duos in Arda, to be fair.
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Tuor: Yeah, it was me who broke [Morleg's] arm. With a wrench. Specifically, this wrench.
I am suffering from Maeglinomaniacal Maeglinophilia.
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