Other contributors have said "If your sister has a little girl and the little girl has a little girl then what are you to her?" is the same question as "How are you related to your sisters grandaughter?" If you believe that these are not asking the same thing and should be answered differently, click here

How are you related to your sisters grandaughter?

Answer:
My sister's daughter (the FIRST "little girl" in the question) would be my Niece, therefore making me her Aunt.

Once my Niece had a daughter (the SECOND "little girl" in the question) she would be my Great Niece making me her Great Aunt. Now, if the Great Niece had a daughter, she would become my Great Great Niece and THEN I would be the Great Great Aunt.

You are the Great Aunt.
Contributor: Cheyenne
First answer by Cheekymonkey41. Last edit by Cheyenne Skyeforest. Contributor trust: 1 [recommend contributor recommended]. Question popularity: 2 [recommend question].