Cousin refers to the daughter of my father's brother, that is, the daughter of an uncle, Guan Zhong, an uncle and Ji's father. She is younger than you (generally, the same grandson and great-grandson can be called a cousin). Cousin refers to the daughter of my father's brother, that is, the daughter of my uncle, Guan Zhong, uncle and Ji, and she is older than you. So you and that person are cousins, and you call her cousin. Cousins refer to children of brothers and sisters of mothers and children of sisters of fathers.