Okay, so... being a cheeky one, I guess the answer is not Elrond (the extra fathers being Maedhros and Maglor)?
How about Numenor itself? It came out of the three Houses of the Edain, so could be said to have three fathers (of the fathers of Men). And its daughter is Gondor, which hung around and eventually met up with Aragorn?
Or, indeed, are you Gondor - your brother being Arnor, your fathers being... Elendil, Isildur, and Anarion?
hS
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