Your daughter and your grandneice are First cousins, once removed.
Your grandniece's daughter is your great-grandniece.
granduncle - grandnephews/grandnieces
Your sister's son is your nephew His sons are your grandnephews, and his daughters are your grandnieces.
Your sister's son is your nephew His sons are your grandnephews, and his daughters are your grandnieces.
Your neice's children are your grandneices and grandnephews. You are their great aunt or great uncle.
The plural of grandniece is grandnieces.
your brother's daughter is you niece
Your aunt's daughter is your first cousin.
your not your daughter is by marriage you are not
Your brother's daughter is your niece. Her daughter is your great niece.
If you are married to your daughter's mother, then her boy is your stepson. If you are not married, then he is no relation to you. Either way, he is your daughter's half brother.
Your daughter is your uncle's grand niece.