There were five wizards/Istari. The two last ones, Alatar and Pallando never had any significance to the story of ME, like Gandalf and Saruman. When Gandalf calls Radagast his cousin is because it tells that they are related, and equal, unlike if Gandalf had said e.g. "uncle". They are not cousins in the way we think, but since they both are Maiar, you could say that they are related.
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Two beer or not two beer, that is the question; by Shakesbeer
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