What's mother's brother's name?

My mother's brother is called uncle, and my uncle is my mother's brother or younger brother, so no matter my own brother or my adopted brother, as long as it is my mother's brother, I will be called uncle.

My mother's brother is called uncle and my sister is called aunt. My mother's brothers all have the same name. My family refers to my mother's cousins, and so do her cousins. If my mother has several brothers, she ranks big uncle, second uncle and third uncle.