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For clarity, lets call your great great grandfather's niece "the niece".
The relationship sequence:
(1) The niece is the daughter of your great great grandfather's sibling
(2) The niece is a 1st cousin of one of your great grandparents
(3) The niece is a 1st cousin once removed of one of your grandparents
(4) The niece is a 1st cousin twice removed of one of your parents
(5) The niece is your 1st cousin three times removed
What else can I help you with?
What relation is your nieces daughter?
Great-niece.
What relation is your sisters daughters children to you?
They would be great nieces or great nephews.
What relation would you call your sister's grandchildren?
They are your great nephews and/or great nieces. Alternately, some people say grand-nephews, grand-nieces.
What relation is my brother's children to me?
Your borther-in-law's children are your nieces and nephews. You are their uncle or aunt, as is your spouse.
What is a female reletives?
Sisters, mother, aunts, grandmothers, nieces, cousins, etc.
What relation are you to your nieces daughter?
You are her great-great Aunt (or great grand Aunt, depending upon your preferred nomenclature). She is your great great niece.
What would my grandfathers nieces granddaughter be relation to me?
Your aunt's grandchildren would be your first cousins once removed, as the your aunt's children are your first cousins.
What relation are you to your nieces sons son?
Your niece's son's son is her grandson. He is your great great nephew and you are his great great aunt or great great uncle, depending on your gender.
What relation is your nieces son to you?
Second Cousin
What relation am i to my great nieces son?
Your niece's son is your grand-nephew. You are the child's grand aunt, or grand uncle (whichever applies).
What are your nieces children to you?
Your niece's children are your great nieces and great nephews.
What are my nieces children to me?
Your great nieces or newfews
