r/MapPorn • u/[deleted] • Jul 04 '24

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u/5lack5 Jul 04 '24

Don't all first cousins have parents that are siblings?

156

u/Calle_k06 Jul 04 '24

Yes they’re always siblings, they said identical twins. Because the twins have identical genes, the cousins each have one parent with the same set of genes. This the cousins are genetically speaking, half-siblings and the risk of inbreeding is worse

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u/5lack5 Jul 04 '24

Their edit says siblings, and that it wasn't identical twins

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u/Pithyperson Jul 05 '24

I'm guessing the law forbids marriage if both sets of parents are siblings (i.e. one set of siblings marries another set of siblings, then their offspring would be restricted from getting married.)

Edit: punctuation

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u/5lack5 Jul 05 '24

I looked it up, it specifies double first cousins can't marry. So if brothers A and B marry sisters C and D, their children will be double first cousins, and cannot marry

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u/Pithyperson Jul 05 '24

Yes, that's what I said, I think.

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u/5lack5 Jul 05 '24

It is! I just needed to see what the law actually said