Simple. Person one had person two. Person two had person three. Person three traveled back in time, stole samples of... stuff from a medical hospital, and technically fathered person one. Then, in the present again, person one and person two both got sex changes (person three is assumed to already be male.)
Right after this is done, person four appears on their doorstep after warping in from another dimension. He is the half brother of everyone mentioned above in the other dimension, but, he is actually both a guy and a girl in one! Therefore, he is both the brother of everyone there and not the brother of anyone there!
Oh... my... god. Someone actually found a logical answer. Can someone give this person a medal? Anyone? Wow. Mind blown.
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Oh... my... god. Someone actually found a logical answer. Can someone give this person a medal? Anyone? Wow. Mind blown.