As others have said before me. Things get a little blurry with the few matriarchal systems in the world. What do I call my sister's children? Fun fact: I remember reading this article in a Dutch paper -- can't find it at the moment, will try harder after posting this. Biologically, their shared father is the closest relationship. What is the importance of having a sister?
Bristol. Age: 30.
If two sisters have the same mother but different fathers does it make them any less of a sister?
Saige. Age: 23.
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Your partner's twin is your sibling -in-law because:. It was about two pairs of identical twins. The sisters both married one of the brothers . So all the children - whether they're her sister's or brother's are just considered siblings.