They would be genetically the same as brothers/sister(depending on if they were both boys or girls or boy/girl), but they would have different fathers, but their fathers would be the same genetically, so would they be brothers/sister genetically.
(Arrested Development fans think of Buster, he was fathered by George Sr.'s identical twin brother Oscar, so does that make him Micheal's 1/2 brother or not? Thats what go tme started on this)
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