Who is Gandalf's and Radagast's common ancestor?

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Originally Posted by Meriadoc1961

In The Hobbit as Gandalf is leading the Dwarves and Bilbo to Beorn's house, Gandalf refers to Radagast as his cousin. Just who is the common ancestor of Gandalf and Radagast that would make them cousins? Who are their parents?

Well, given Gandalf's origin as a Maia, I would say it's a term of respect.