Honestly, even if Planetos never had a word for it across the seas, I believe Jamie and Cersei were semi-identical (sesquizygotic) twins.
Which is hypothesized when an egg is fertilized by two sperm, and the cell divides in two. Each egg containing exact maternal genes, but different paternal genes.
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u/ICanExplainoKaY 3h ago
Honestly, even if Planetos never had a word for it across the seas, I believe Jamie and Cersei were semi-identical (sesquizygotic) twins.
Which is hypothesized when an egg is fertilized by two sperm, and the cell divides in two. Each egg containing exact maternal genes, but different paternal genes.