How are you related to this person their grandmother is a sister of your grandmother?

Answer 1

Your grandmother's sister is your great aunt. (Some would say grand aunt).

Your great aunts' grandchild is your second cousin. Her great grandchild is your second cousin, once removed.

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Answer 2

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.

Answer 3

First cousins once removed. They would be your parent's cousin.

Answer 4

The great granddaughter of your great grandmother's sister is your third cousin.

Answer 5

The great-grandchild of your grandmother's sister is your second cousin, once removed.

Answer 6

Your grandmother's sister's child is the first cousin of one of your parents, and you first cousin once removed.

Answer 7

Second cousins

Answer 8

You are second cousins once removed.