[Richard] and his brother [Leonard] played a round of golf. [Richard]'s sister [Natasha] watched in excitement. [Cindy] took her son [Leonard] to the park for the afternoon.
('Cindy', 'Natasha')
[Cindy] took her son [Leonard] to the park for the afternoon. [Richard] and his brother [Leonard] played a round of golf. [Richard]'s sister [Natasha] watched in excitement.
[{('Cindy', 'daughter', 'Natasha'): [('Cindy', 'son', 'Richard'), ('Richard', 'sister', 'Natasha')]}, {('Cindy', 'son', 'Richard'): [('Cindy', 'son', 'Leonard'), ('Leonard', 'brother', 'Richard')]}]
['son', 'brother', 'sister']