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There are some Elves from late texts that do not appear in the tree in the 1977 Silmarillion.
As for Galadriel, Tolkien's idea was that Orodreth (Arothir) was the son of Angrod, according to the later notion. Here Christopher Tolkien went with the tradition from earlier texts (for the 1977 Silmarillion).
Arothir (Orodreth) is not Finarfin's son according to The Shibboleth of Feanor, which is fairly late -- according to Scull and Hammond's Reader's Guide dated '1968 or later', or IIRC, 1969 or later, under an entry in Chronology.
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