Your her great great aunt!
Your sister's granddaughter is your great niece and you are her great aunt (if you are a woman) or great uncle (if you are a man).
Great neice
Your great uncle's granddaughter is your second cousin.
Your mothers sisters Granddaughter is your second cousin
Your her great great aunt!
WHAT relationship* is your Gramps to your great granddaughter? pretty tricky but (distant sisters one off)
You and the granddaughter of your grandmother's brothers, and sisters, are first cousins.
Your nephew's granddaughter is your great great niece. Depending on whether you are male or female, you are that child's great great uncle or great great aunt.
If your great great uncle (the brother of your great grandparent) had a great great granddaughter, you would be third cousins, once removed.
Yes, she would be your great-aunt.
The great-great-great-granddaughter of Uranium-238 is Radium-226. For more information, please see the related link below.
If you are a woman, you are your great grandmother's great granddaughter so your son is the son of her great granddaughter. But there are other possible relationships to other of her great granddaughters.The great granddaughter could be your sister. Then your son is her nephew and she is his aunt.The great granddaughter could be your first cousin. Then she and your son are first cousins, once removed.The great granddaughter could be your second cousin. Then she and your son are second cousins, once removed.