well biology is kinship-- and they use the same word for people who have the same degree of 'common genes' even if they didn't know about genitics.

my neices and nephews and grandchildren all share the same amount of kinship.

in times past, i think this kinship might have been a factor. what with early deaths, and adult having serial monagomy, there would have been step families, and crossed relations all over the place.

recognizing kinship, was more important that sex of the kin.
--what is the word for grandparent? Old mother? or something similar? often it is, since often the person married to a biological grandparent was no relation (no kin) at all.

in a will or deed of testiment, neices,nephews and grandchildren might all be entitled to the percentage of the estate--