Is your mother's cousin; Girls have many relatives before they get married, but only their husbands' relatives after they get married, which leads to many people only know their fathers' cousins. Your cousin and your mother have a common grandfather. Maybe your mother and your cousin played with mud every day before you were born.

Some people live in grandma's house, while others raise grandpa's house. Children born in grandma's house are close to their uncles' cousins. When you were young, you played with my uncle's cousins. When she got married and had children, the children called you cousin.

If you were born in a wet nurse's house, your aunt's daughter will call you cousin.

In short: cousin's children call you cousin, while your mother's cousin calls you cousin.

I think it depends on two aspects: whether your mother was brought up by your grandmother or your mother's grandmother, that is, whether your mother grew up with her cousin (that is, your cousin) when she was a child;

Secondly, after your mother got married, your cousin moved a lot.

Visible, in China, women are really two concepts before marriage.