[Roy] watched his daughter [Martha] playing basketball. [Martha] threw the ball to her brother [Herman] who made the basket.
('Roy', 'Herman')
[Roy] watched his daughter [Martha] playing basketball. [Martha] threw the ball to her brother [Herman] who made the basket.
[{('Roy', 'son', 'Herman'): [('Roy', 'daughter', 'Martha'), ('Martha', 'brother', 'Herman')]}]