This is unlikely to be a marriage that can work, except as a marriage of convenience, and of short duration. If you want to marry your great great grandniece, you are talking of marrying the great great granddaughter of your brother or sister.
While there is not a close genetic relationship between two people separated by 4 generations, there is also not a close age relationship. Assuming each generation had its first child at the age of 15 years, there would be around 60 years age difference between the two people involved.
Yes, your niece's daughter is your grand niece. You are her great aunt or great uncle.
i think its a GRAND niece instead of great niece and u would be a grand uncle or a grand auntie to her
No. A great grand child is the child of your grandchild. The child of your grand niece is your grand niece or grand nephew, depending on the child's sex.
No
Your sister's grand daughter is your grand niece or great niece. You are her great aunt or great uncle.
If you are a woman, you are great great aunt to your niece's granddaughter. If you are a man, you are great great uncle to your niece's granddaughter. In either case, your niece's granddaughter is your great great niece.
Great grand niece
Your niece's son's daughter is your great grand niece. Your niece's son is your grand nephew or your great nephew, whichever term you prefer.
Your niece's son is your grand-nephew. You are the child's grand aunt, or grand uncle (whichever applies).
Your daughter and your niece are first cousins Your daughter and your great grand niece are first cousins, twice removed.
If you have a niece or nephew, it is their daughter.
You are her grand uncle (or great aunt) and she is your grand niece.