Your father's sister's son (or daughter) is your first cousin.
The sons of your father's sister are your first cousins.
Call to Glory - 1984 Fathers and Sons 1-18 was released on: USA: 29 January 1985
sister friend
Aunty and Uncle.
Aunt
You would call your father's sister "பெரிய அந்தை" (periya anthai) in Tamil.
My sister's son is my nephew.
philapple Uncle
No, because my father's sister (my aunt) does not have any sons, she only had daughters.
By her name- Dexter
Dallas - 1978 Fathers and Sons and Fathers and Sons 14-16 was released on: USA: 8 March 1991
You can refer to your sister's children as your nieces and nephews. If your sister has daughters, they are your nieces, and if she has sons, they are your nephews. Collectively, you can call them your nieces and nephews or simply refer to them as your sister's kids.