A sister who has two brothers with children.
To be tried twice for the same crime would create double jeopardy.My aunt loved watching Double Jeopardy on television.
Examples of double possessives:My friend's house is next to the library. (double possessive)I bought some flowers for Jane's mother'sbirthday. (double possessive)My mother's brother's wife is my aunt. (triple possessive)
Sanderfield Illinois, some years after 2006 October, Aunt Myrlie's house.
Aunt's
Tom Sawyer's aunt was Aunt Polly.
Great aunt.
Your great aunt.
Aunt
Your aunt is your daughter's great aunt. Your daughter is your aunt's great niece.
If the dad's sister's aunt is also your dad's aunt, then your dad's aunt is your great aunt. However if she is not your dad's aunt, then she is your aunt's aunt and not necessarily related to you.
Your father's aunt is your great aunt.
Your father's aunt is your great aunt.