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+Idea: instead of in-laws, they have by-claims, e.g. my "brother by-claim" is my sister's husband. This only applies to males, however, because females are the claimants. So in claiming a husband for themselves, they claim a brother for their siblings. I'm not sure what the term for a sister-in-law would be, but something regal regarding her position as obviously superior to males. This is inkeeping with the draconian matriarchal worldbuilding.
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