[Angelica] was playing in the sandbox with her brother [Ronald]. [Tracy] was eating dinner with her sister [Dorothy]. [Tracy]'s brother [Robert] was n't invited. [Robert] and his daughter [Angelica] helped to make Thanksgiving dinner together.
('Dorothy', 'Ronald')
[Tracy] was eating dinner with her sister [Dorothy]. [Tracy]'s brother [Robert] was n't invited. [Robert] and his daughter [Angelica] helped to make Thanksgiving dinner together. [Angelica] was playing in the sandbox with her brother [Ronald].
[{('Dorothy', 'nephew', 'Ronald'): [('Dorothy', 'brother', 'Robert'), ('Robert', 'son', 'Ronald')]}, {('Robert', 'son', 'Ronald'): [('Robert', 'daughter', 'Angelica'), ('Angelica', 'brother', 'Ronald')]}, {('Dorothy', 'brother', 'Robert'): [('Dorothy', 'sister', 'Tracy'), ('Tracy', 'brother', 'Robert')]}]
['sister', 'brother', 'daughter', 'brother']