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This is an unclear and rarely used phrase - "your brother's daughter through marriage."
If your brother married a woman and they had a daughter, the daughter is "your brother's daughter through marriage" since the one followed the other. That daughter is your niece.
If your brother married a woman who already had a daughter from a previous relationship, that daughter is your niece only if your brother adopted her. If he did not adopt her, you are not related. However, you can treat her as your niece if you want to.
What else can I help you with?
What is brothers daughter called?
Are you asking what you call your brothers daughter? Well if you are your brothers daughter is called your niece.
What relation is my step sister's daughter to me?
Through marriage your step - sister's daughter is your step-niece!
Is your sister's niece through her marriage also your niece?
Since it's her husband's niece the niece is just your sister's niece through marriage and not your niece.
What do you call your brothers daughter?
Niece
What do you call brothers daughter?
A niece
What you call brothers daughter?
A niece
What is the relationship name for your brothers daughter to your daughter?
Your sister's daughter is your niece and you are her aunt (if you are a woman) or her uncle (if you are a man).
What is relationship for me to brothers daughter?
Your brother's daughter is your niece..and you are her AUNT.
Whom to you your brothers daughter?
Your brother's daughter would be your niece.
What is bothers daughter called?
Your brothers ( or sisters ) daughter is your ( niece )
What relation is brothers stepdaughter to you?
your step niece,,, if it was your brothers own daughter it would be your niece, since its his stepdaughter, than its your step niece.
What do you call your half brothers daughter?
Your niece.
