No, your first cousin's daughter is your first cousin once removed.
Your niece and your son are second cousins. Your niece's child and your son are second cousins once removed.
Your niece and one of your grandson's parents are first cousins. That makes your niece a first cousin once removed of your grandson.
You and your grandmother's great niece are second cousins.
Your brother's grandchild is your Great Nephew or Great Niece and you are their Great Aunt or Great Uncle.
Your first cousin's daughter is first cousin once removed to your grandson, and he to her. Your second cousin's daughter is second cousin once removed to your grandson, and he to her.
Your daughter and your niece are first cousins. Your daughter than your niece's son are first cousin's once removed. Your daughter's child and your niece's child are second cousins to each other.
Your niece and your son or daughter are first cousins. That would make your niece and your grandchild first cousins once removed. Your niece's child and your grandchild are second cousins.
Your daughter and your niece are first cousins. Your daughter than your niece's son are first cousin's once removed. Your daughter's child and your niece's child are second cousins to each other.
Your niece and your daughter are first cousins. Your niece's daughter and your daughter are first cousins, once removed.
Your niece and your daughter are first cousins. Your daughter and the daughter of your niece are first Cousins, once removed.
Either they are second cousins or technically not related at all. Your cousin's niece would be one of her siblings' children, in which case it would one of your cousin's daughters, or her spouses' niece, in which case there is no blood relationship, but most families would refer to them as a cousin.
Your daughter and your niece are first cousins Your daughter and your great grand niece are first cousins, twice removed.
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
They are second cousins
Your great great niece is the granddaughter of your niece or nephew. Your daughter and your niece or nephew are first cousins. Your daughter and your great great niece are first cousins, twice removed.
Your daughter and your niece are first cousins. Your daughter and your niece's daughter are first cousins, once removed.
Your daughter and your niece's daughter are first cousins, once removed.