[Robert] and his sister [Tracy] were wrapping gifts for Christmas. [Robert]'s daughter [Elsie] desperately wanted to join them. [Louis] took his niece [Elsie] fishing Saturday. They caught a couple small fish. [Louis] did n't get along very well with his sister [Dorothy] for some reason.
('Tracy', 'Dorothy')
[Robert] and his sister [Tracy] were wrapping gifts for Christmas. [Robert]'s daughter [Elsie] desperately wanted to join them. [Louis] took his niece [Elsie] fishing Saturday. They caught a couple small fish. [Louis] did n't get along very well with his sister [Dorothy] for some reason.
[{('Tracy', 'sister', 'Dorothy'): [('Tracy', 'brother', 'Robert'), ('Robert', 'sister', 'Dorothy')]}, {('Robert', 'sister', 'Dorothy'): [('Robert', 'brother', 'Louis'), ('Louis', 'sister', 'Dorothy')]}, {('Robert', 'brother', 'Louis'): [('Robert', 'daughter', 'Elsie'), ('Elsie', 'uncle', 'Louis')]}]
['brother', 'daughter', 'uncle', 'sister']