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Tuesday, May 31, 2011

The fathers (blue) of families A and B are identical twins; likewise, the mothers (red) are identical twins. Therefore, all of their children (yellow) are genetic siblings.
The fathers (blue) of families A and B are identical twins; likewise, the mothers (red) are identical twins. Therefore, all of their children (yellow) are genetic siblings.

TIL that children of identical twins are first cousins by law but half siblings genetically. And if a pair of identical males were to marry a pair of identical females and have children, all children would genetically be full siblings regardless of which couple was their "real" parents.

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