My aunt is married to my...
uncle
My brother's wife is my _____
sister-in-law
Jane is my mother's sister, so Jane is my...
aunt
My brother's son is my
nephew
My brother and sister are my...
siblings
I am Sarah's uncle, so Sarah is my...
niece
For my great-grandmother I am her _____
great-granddaughter/great-grandson
My aunt's son is my...
cousin
Joe is my brother's son, so Joe is my...
nephew