Wat the heck in this question yaar?
its maternal uncle.
you are uncle your son is first cousin to your sisters his aunt sons or daugters
a : a child of one's uncle or aunt b : a relative descended from one's grandparent or more remote ancestor by two or more steps are cousins and when those sons and daughters have kids they become second cousins etc.
Your sister's son is your nephew.
Grand-Nephew
Neice or nephew no dummy its nephew
Your sister's son is your nephew His sons are your grandnephews, and his daughters are your grandnieces.
your second nephew
She is your third cousin.
The father's son is the uncle of the son of the father's daughter.
You would be his Great Uncle or Great Aunt He in turn would be your Great Nephew.
Charles Drew had 3 sisters, a wife, 3 daughters, and a son.
Your sister's son is your nephew and you are his aunt (if you are female) or his uncle (if you are male.
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.