The History of Galadriel and Celeborn

[Aiwendil]

Originally Posted by Findegil

Kinship: That first cousins are not allowed to marriage is wrong. It would only be forbidden if the parents that were not brethren and/or sister were also akin.

I'm going to have to ask for a citation on that one. The paradigmatic example of the forbidden first cousin relationship is, after all, Idril and Maeglin; and whatever Eol's ancestry (kinsman of Thingol or Tatyarin Avar), there is no suggestion that he is related to Elenwe.