Your dad's nephew is your first cousin, his children are your first cousins once removed.
Your father's uncle's children are your father's first cousins, and your first cousins, once removed.
Your nephew's sons are your great nephews and his daughters are your great nieces. You are their great aunt, if you are a woman, or their great uncle, if you are a man.
Your sister's husband is your children's uncle. They are his nieces and nephews.
you are their gran-uncle or gran-aunt depending on your gender. they are your gran nieces and gran nephews depending on their gender.
Your brother's children would be your nieces and nephews.
nece and nefu i spelled it wrong though sorry if someone could update this better Your daughters are his nieces by marriage and your sons are his nephews by marriage.
The children of your husband's siblings are your nieces or nephews. Their children are your great-nieces or great-nephews.
Nephews are the sons of your brother or sister. Therefore nephews who are not brothers to each other are first cousins to each other.
Great nephew
I think one of Abrams nephews name is Isaac.
They are your nieces and nephews.
Your brother's children would be called your nieces or nephews.
He is their Uncle and they are nieces and nephews.
Your brother's wife's kids would be your nieces or nephews.