[Douglas] called his aunt, [Amy], and asked if she would be coming over tonight. [Amy] said yes, and told [Douglas] she was bringing a surprise. [Douglas] asked his father, [George] to help him build a birdhouse.
('George', 'Amy')
[Douglas] asked his father, [George] to help him build a birdhouse. [Douglas] called his aunt, [Amy], and asked if she would be coming over tonight. [Amy] said yes, and told [Douglas] she was bringing a surprise.
[{('George', 'sister', 'Amy'): [('George', 'son', 'Douglas'), ('Douglas', 'aunt', 'Amy')]}]
['son', 'aunt']