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Of course she is. The two of you share a common ancestor in one or two of your great great grandparents.
The granddaughter of your great grandmother's sister is your second cousin, once removed.
What else can I help you with?
How am I related to my sister's great granddaughter?
Your her great great aunt!
What relationship is your granddaughter to your sister?
Your granddaughter is your sister's great niece. Your sister is your granddaughter's great aunt.
Are you related to your great great grandfather's sister's granddaughter?
Yes, she would be your great-aunt.
What relation is your sister's granddaughter's daughter to you?
Your sister's daughter is your niece. Your sister's granddaughter is your great niece Your sister's granddaughter's daughter (your sister's great granddaughter) is your great great niece. You are her great great aunt, if you are a woman, or her great great uncle, if you are a man.
What relation is your grandaughter to your sister-in-law?
Your granddaughter's husband might be called your grandson-in-law, although the term is rarely used. Hissister is your granddaughter's sister-in-law, but is not related to you.
What do you call the half sister of your granddaughter's half sister?
The half-sister of your granddaughter's half-sister is your granddaughter, or is not related to you.
Are you related to your great-grandmother's sister's husband's brother's great granddaughter?
No. The sister is a relation, and her husband is an in-law. The husband's brother is no biological relation either. Therefore, the great granddaughter of the husband's brother is not a relation.
What relationship is your granddaughter to your great granddaughter?
Your sister is her great grandaunt.
What relationship is my granddaughter to my sister?
Your sister is the great-aunt (also written great aunt) of your granddaughter.
Who is my sister to my son's daughter?
Your son's daughter is your granddaughter. Your sister is your granddaughter's great aunt.
What should you call your sister's granddaughter?
Your sister's daughter is your niece and her granddaughter is your great niece.
What is your wife's sister's daughter's daughter to you?
You and your wife are great uncle and great aunt to your wife's sister's granddaughter. The granddaughter is your great niece.
