[Harry] asked his mother, [Michelle], to bake him a cake. She told him to wait for his birthday. [Katherine] and her sister [Helen] played golf together. [Katherine] won easily. [Michelle] is taking a trip to see her sister [Helen].
('Harry', 'Katherine')
[Harry] asked his mother, [Michelle], to bake him a cake. She told him to wait for his birthday. [Michelle] is taking a trip to see her sister [Helen]. [Katherine] and her sister [Helen] played golf together. [Katherine] won easily.
[{('Harry', 'aunt', 'Katherine'): [('Harry', 'mother', 'Michelle'), ('Michelle', 'sister', 'Katherine')]}, {('Michelle', 'sister', 'Katherine'): [('Michelle', 'sister', 'Helen'), ('Helen', 'sister', 'Katherine')]}]