Luthien is the only example of Ainur offspring we can now accept as canonical.
However, in earlier concepts Eonwe was Manwe and Varda's son, and Gothmog was Morgoth's son (Eru knows how...). I believe Arien may also have been someone's daughter at one point.
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Among the friendly dead, being bad at games did not seem to matter
-Il Lupo Fenriso
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