Your aunt's son or daughter is your cousin. Your cousin's children are one generation removed from yours, so your cousin's children are your first cousins once removed. They are also your aunt's grandchildren. The children of your first cousin once removed would be your first cousins twice removed. They are also your aunt's great grandchildren. Second cousins are of the same generation and share the same great grandparents.
Your relative ----------------------------------Your relationship
Aunt ----------------------------------------------Nephew/niece
Aunt's child --------------------------------------First cousin
Aunt's grandchild -------------------------------First cousin once removed
Aunt's great grandchild -----------------------First cousin twice removed
Your grandfather has a sister. That makes her your great aunt.
A niece is a child of your brother or sister, or the brother or sister of your spouse.
Since your great aunt is your grandfather's sister, her niece could be your mother, who is your grandfather's child, your mother's sister, or your mother's first cousin, the child of your great aunt's sister or brother who is not your grandfather. So your great aunt's niece is either your mother, your aunt, or your first cousin once removed.
Your great aunt's aunt is your great great aunt.
First cousins, twice removed. Aunts daughter is your cousin. Aunts daughters daughter is cousin once removed Aunts daughters daughters daughter is cousin twice removed.
They would be your second cousin. Your great aunt is the sister of one of your grandparents. Your parents and the granddaughter's parents are first cousins.
Your great uncle's granddaughter is your second cousin.
your niece
Your her great great aunt!
yes
Your her great great aunt!
great nephew
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.