Please take heed of what Legalos has just said, Guildo. At no point is Radagast said to have been Gandalf's brother, and there's certainly not even a hint that he masquerades as Cirdan the Shipwright, who is a totally distinct character. Furthermore, although 'the Shipwright' is a title in this context, it was given to Cirdan because of his shipbuilding, rather than referring to any official position he held.
I should also be wary of your spell-checker, which is, I believe, inserting some egregious spelling mistakes on your behalf; notably 'Radaghast' and 'Shipwrite'.
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perhaps...knew he needed help in his most perilous times therefor sent Gwaihir to help him
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Actually, Radagast's possible role as a communications officer for the Istari through his affinity with birds has already been mentioned in another thread, although I'm currently unable to find it. There it was suggested that Gwaihir's convenient appearance at certain times could have been the Brown Wizard's doing, but I stress that this was only a theory, and that there is no explicit textual evidence to prove it.
As for possible mental communication between the Istari, that too is discussed in the excellent Osanwe-Kenta thread started by lindil, although without specific reference to the Wizards.