Your grand-nephew and your daughter are first cousins, once removed.
Your sister's daughter's son would be your grandnephew.
Yes. Wikipedia says he is the grandnephew of the Feminist Margaret Fuller
It's your cousin. Lets say: Grandma Wilma has a brother Bill. Bill is your great Uncle. His daughter Joan is your parent's First Cousin and your First Cousin, once removed.
Your grandniece is the granddaughter of your brother or sister, and the daughter of your niece or nephew. Your grandnephew is the grandson of your brother or sister, and the son of your niece or nephew.
A grandnephew is the son of your niece or nephew. In other words, if your sibling has a child, and that child has a son, that boy is your grandnephew. The term reflects a generational relationship, indicating a link to your family through your siblings' children.
Your cousin's wife is not related to you or to your daughter - unless your daughter marries their son or your wife is related to your cousin's wife.
his grandnephew Octavius
Your husband's cousin is not related to you. His/her daughter is not related to you either.
Your niece's grandson is are your great-grandnephew.
They are second cousins
Your daughter would b related to her uncles child because they would b cousins
If your daughter is also your wife's daughter, your daughter and your wife's first cousin are first cousins, once removed, otherwise they are not related.