[Andrea] was n't sure what to buy her brother [Douglas] for his birthday. She decided to ask her mother, [Lillian], for some advice.
('Douglas', 'Lillian')
[Andrea] was n't sure what to buy her brother [Douglas] for his birthday. She decided to ask her mother, [Lillian], for some advice.
[{('Douglas', 'mother', 'Lillian'): [('Douglas', 'sister', 'Andrea'), ('Andrea', 'mother', 'Lillian')]}]
['sister', 'mother']