[Douglas] was so excited to introduce his new girlfriend to his mother, [Lillian]. [Douglas]'s aunt, [Amy], asked [Douglas] to mow the lawn for her. [Douglas] said he could n't because he had a bad back.
('Lillian', 'Amy')
[Douglas] was so excited to introduce his new girlfriend to his mother, [Lillian]. [Douglas]'s aunt, [Amy], asked [Douglas] to mow the lawn for her. [Douglas] said he could n't because he had a bad back.
[{('Lillian', 'sister', 'Amy'): [('Lillian', 'son', 'Douglas'), ('Douglas', 'aunt', 'Amy')]}]
['son', 'aunt']