Then she told me that I was her niece, and that I was to call her 'Aunt Rita.'  
I've never met her before but she was telling me to call her Aunt Rita because I was her niece.
mnli hypothesis: I've never met her before but she was telling me to call her Aunt Rita because I was her niece. premise: Then she told me that I was her niece, and that I was to call her 'Aunt Rita.'  