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Most likely, your cousin
Another answer:Your niece's first cousin would be your niece or nephew (or your son or daughter).
Explanation:
Your parents have 3 children: you, your brother, and your sister.
Your brother has a daughter. She is your niece.
Your sister has a son or daughter. He or she is your niece's first cousin. He or she is also your nephew or niece.
You have a daughter. She is your niece's first cousin.
It helps if you draw this out on paper.
What else can I help you with?
What relation is your grandfathers nieces son to you?
Your grandfather's niece is a first cousin of one of your parents. Her son is your second cousin.
What relation is your nieces son to you?
Second Cousin
What relation are you to your father's nieces husband?
You would be a first cousin by marriage, in other words, there is no direct relationship between you.
Who is your first cousin's first cousin to you from their other side of their family?
Your cousin's cousin is no relation to you.
What is your relation to your mother's first cousin?
Your mother's first cousin is your first cousin, once removed.
What relation is Mum's first cousin?
Your mother's first cousin is your first cousin once removed.
What is your mother's cousin's relation to you?
Your mother's first cousin is your first cousin, once removed
If your cousin has a child what is your relation to it?
The child of your first cousin is your first cousin, once removed.
What is your first cousin's wifes relation?
The wife of your first cousin is not related to you.
What relation is your aunts cousin to you?
Your Aunt's first cousin may be your second cousin, onve removed or may be no relation to you at all.
What relation to you is your Cousin's aunt's?
Your Aunt's first cousin may be your second cousin, onve removed or may be no relation to you at all.
What relation is your first cousin's husband to you?
Either your second cousin or your cousin in-law
