Family and relatives

My sister is my father's (a)   .

Who is my father's brother?

(a)  

My son is my daughter's (a)   .

My mother's mother is (a)  

My sister is my father's (a)   .

Who is my sister's daughter?

(a)  

My mother is my son's (a)   .

My aunt's daughter is my (a)   .

My brother's son is my (a)   .

My wife is my son's (a)   .