What (who) is couster - definition
couster
An individual who is both your sister and your cousin. An example of this phenomena would be your father divorcing your mother, and then marrying your mother's sister. They then have a baby girl. Said baby is now your couster.
I'd like you to meet my mother, my father, my aunt, and my couster.
I'd like you to meet my mother, my father, my aunt, and my couster.
