[Dorothy]'s sister, [Tracy], recently started acting. [Marie] and her sister [Dorothy] are the only children in their family. [Harold] is coaching his daughter [Tracy]'s softball team this summer. [Harold] and his son [Louis] went to the skating rink.
('Louis', 'Marie')
[Harold] and his son [Louis] went to the skating rink. [Harold] is coaching his daughter [Tracy]'s softball team this summer. [Dorothy]'s sister, [Tracy], recently started acting. [Marie] and her sister [Dorothy] are the only children in their family.
[{('Louis', 'sister', 'Marie'): [('Louis', 'sister', 'Tracy'), ('Tracy', 'sister', 'Marie')]}, {('Louis', 'sister', 'Tracy'): [('Louis', 'father', 'Harold'), ('Harold', 'daughter', 'Tracy')]}, {('Tracy', 'sister', 'Marie'): [('Tracy', 'sister', 'Dorothy'), ('Dorothy', 'sister', 'Marie')]}]
['father', 'daughter', 'sister', 'sister']