The great niece and the great uncle's son are first cousins once removed. Many cultures, but not all, would consider this to be too close a relationship for marriage.
You are her great-aunt/uncle. She is your great-niece.
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.
Your niece's children are your great nieces and great nephews, and you are their great uncle. Your uncle could be the father of your niece, and thus the grandfather of your niece's children.
No, it can't be. My uncle can't marry my younger sister because both are related by blood. Everywhere, there are many rules and regulations against them. This is an incest and cause genetical disorders and pedigree collapse. Noneover the world, these marriages are allowed, eventhough many foolish girls in South India marry their maternal uncle and got arrested and killed.
A niece's son calls his uncle his uncle, just like everyone else.The niece's son calls her uncle his great uncle. He is the great uncle's great nephew.
Your niece's son is your great nephew. You are his great aunt or great uncle.
You are a great great aunt or great great uncle to your great great niece (or great grand niece).
To your uncle, you are his niece or nephew.
Yes, your niece's daughter is your grand niece. You are her great aunt or great uncle.
You are the great uncle of your niece's child if you are male. If you are female, you are the child's great aunt.
great niece