The person is your nephew :)
cousin
Grand-Nephew
Your sister's son is your nephew His sons are your grandnephews, and his daughters are your grandnieces.
your second nephew
Charles Drew had 3 sisters, a wife, 3 daughters, and a son.
Charles Drew had 3 sisters, a wife, 3 daughters, and a son.
Your sister's son is your nephew His sons are your grandnephews, and his daughters are your grandnieces.
They are second cousins
Charles Drew had 3 sisters, a brother, a wife, 3 daughters, and a son.
Charles Drew had 3 sisters, a brother, a wife, 3 daughters, and a son.
No, because my father's sister (my aunt) does not have any sons, she only had daughters.
They are cousins-in-law and are not related in any way by blood.