I would believe the oldest daughter in the family or son.
Your mother's first cousin's daughter is your second cousin.
You mother's sister is your aunt. Your aunt's daughter is your first cousin. Your first cousin's daughter is your first cousin, once removed. So your mother's sister's daughter's daughter is your first cousins, once removed.
The mother
The daughter of your mother's sister is your first cousin.
Your mother's sister is your aunt and her daughter is your first cousin.
Your mother's sister is your aunt and her daughter is your first cousin.
In "Two Kinds," why is the daughter at first excited about her mother's ambition for her?
Your mother's sister is your aunt.Your aunt's daughter's daughter is her granddaughter, and you first cousin, once removed.
Your mother's mother is your grandmother.Your grandmother's brother is your great uncle.Your great uncle's daughter is your mother's first cousin, and your first cousin, once removed.
Your mother's first cousin is your first cousin once removed. Your mother's second cousin is your second cousin once removed. If you are talking about your mother's first cousin once removed, you may be first cousins twice removed or second cousins, depending on the specifics.
daughter's day for a mother is the day when she first saw her daughter's face. So it is a personal date for every mother.
Your aunt is the sister of either your mother or your father. Your aunt's sister is either:your mother, and her daughter is you (if you are a girl) or one of your sisters, oranother one of your mother's sisters, and her daughter is your first cousin, or,one of your father's sisters and her daughter is your first cousin.