FaceTime iMac to iPhone/iPad

i'm buy first mac , have question can't find answer to. if use facetime login on imac can facetime iphone or need own account? can have multiple accounts able facetime wife's ipad 2 , daughter's ipod? can have 3 way conversation? don't think it's possible guys may know work around.

 

you cannot call same facetime address calling out from. caller , recipient of call must have different address.

 

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