[Bret] and his aunt [Michelle] are spending the day together. [Katherine] went out to lunch with her sister [Helen] and her son [Bret].
('Helen', 'Michelle')
[Katherine] went out to lunch with her sister [Helen] and her son [Bret]. [Bret] and his aunt [Michelle] are spending the day together.
[{('Helen', 'sister', 'Michelle'): [('Helen', 'sister', 'Katherine'), ('Katherine', 'sister', 'Michelle')]}, {('Katherine', 'sister', 'Michelle'): [('Katherine', 'son', 'Bret'), ('Bret', 'aunt', 'Michelle')]}]