I find it weird when Valar have brothers and sisters. Because they are all the children of Eru. How were any of the other ones not brothers and sisters of each other?
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At the beginning of the Silmarillion it says that Melkor was Manwe's brother IN ILUVATAR'S EYES! Meaning they aren't actually brothers and sisters, they are just seen that way in Iluvatar's eyes.
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Sing my world into being, Ainur. The universe needs your power!