How is it that my sister has half a brother-in-law?

To sum up, my sister got married early and had children, so my little sister inevitably came to look after my little nephew. It is also possible that my sister has no children. Little sister will often visit her sister, help her do some housework or go to her sister's house to play, so that she can spend more time with her brother-in-law. For the above reasons, there is a folk saying that "a younger sister has half a brother-in-law".

Introduction of the younger generation:

1, grandma-a man's grandmother.

2, son-in-law-daughter's grandfather.

3, niece-niece's grandmother.

4. My niece's grandfather.

5, nephew-nephew's grandmother.

6, nephew-niece's grandfather.

7. Granddaughter-Granddaughter's grandmother.