The niece could be the daughter of the sister-in-law's sibling and not related to you, so you could marry her. However, the niece could also be your mother or your aunt, in which case you could not marry her. Erm, but whover readwhat this guy just wrote, I expect you're wondering WHY WOULD YOU EVEN BOTHER? DON'T YOU HAVE ANYTHING BETTER TO DO??
The closest relative (in most states) that a half niece can marry is still a second cousin. It does not matter whether there is a blood relationship.
Your grandmother's niece is the daughter of her brother or sister, thus the daughter of your parent's aunt of uncle and of your great aunt or great uncle. Your grandmother's niece's daughter is the granddaughter of one of her siblings. Grand children of siblings are second cousins to each other, so you and the daughter of your grandmother's niece are second cousins.
No.
It could be your father. Your niece's daughter's grandmother is your aunt. Her brother's son's father is either your father or your uncle.
To keep it simple, let's call your great grandmother's niece "The niece"The sequence of the relationship:(1) The niece is the daughter of your great grandmother's sibling(2) The niece's sister is also the daughter of your great grandmother's sibling, and therefore also her niece.(2) The niece and her siser are 1st cousins of one of your grandparents(3) The niece and her sister are 1st cousins, once removed, of one of your parents(4) The niece and her sister are your 1st cousins, twice removed
Your great great grandmother's niece is the daughter of her brother or sibling and thus the first cousin of one of your great grandparents. Therefore, the niece is your first cousin, three times removed
Your grand mother's niece is your parent's first cousin. Her children are your second cousins.
The relationship is probably to be good to the niece
You are if you are a guy, and that does seem like a guy question.Another answer:It's a long way of putting it, but your niece's daughter's grandmother's brother's son's father is you.
Your grandmother's brother is your great uncle and you are his great niece or great nephew. Your child is his great great niece or great great nephew.
Your grand mother's niece is your parent's first cousin. Her children are your second cousins.
You and your grandmother's great niece are second cousins.
Your grandmother's sister is your daughter's great great aunt. Your daughter is the great great niece of your grandmother's sister.