(To motivate this post, you may want to read https://cbbforum.com/viewtopic.php?f=2 ... 35#p307235
Adpihi and Reptigan have classificatory kinterm systems, for the most part; more specifically they have systems of the subtype commonly associated with prescriptive marriage systems.
Usually the subtype of classificatory kinterm systems I’m talking about are distinguished by having FB=F and MZ=M; that is, usually people speaking these languages call Father’s Brothers (FB) by the same term they call Fathers, and call Mother’s Sisters (MZ) by the same term they call Mothers.
so brother and half-brother and step-brother are all just “brother”,
and sister and half-sister and step-sister are all just “sister”.
But also, parallel-cousins count as siblings.
My father’s brother is my father, so my father’s brother’s son is my father’s son is my brother, and my father’s brother’s daughter is my father’s daughter is my sister;
And likewise my MZ is my M, so my MZS is my MS is my brother and my MZD is my mother’s daughter is my sister.
However I have identified an occasional, circumstantial, need, for their languages to be able to identify “actual” mother or fathers as opposed to classificatory mothers or fathers; and “actual” half-brothers and half-sisters as opposed to classificatory half-siblings; and parallel cousins as opposed to brothers and sisters; and so on.
These are needed only when talking about what to name your kids, or who to invite to be godparents at the naming ceremony, or who not to marry.
From here on in this post all the kinships will be “actual” rather than classificatory.
Certain second-cousins and parallel-cousins and half-siblings, shouldn’t marry certain parallel-cousins and half siblings.
Edit: I can summarize it thusly.
Two men who share an actual greatgrandfather or an actual granduncle need to be cautious about marrying two women who share an actual grandfather or an actual uncle.
And two women who share an actual greatgrandmother or an actual grandaunt need to be cautious about marrying two men who share an actual grandmother or an actual aunt.
If such a pair of married couples is formed, they need to be careful about duplicating the entire individual names of their offspring.
I hope I didn’t screw up any of that by trying to simplify it in my head as I was typing it.
If so I’ll correct and/or simplify and/or condense it later!