[John] wanted to buy his mother, [Lillian], a birthday present. But he did n't know what to get her. [Lillian]'s daughter, [Ann], just graduated high school.
('John', 'Ann')
[John] wanted to buy his mother, [Lillian], a birthday present. But he did n't know what to get her. [Lillian]'s daughter, [Ann], just graduated high school.
[{('John', 'sister', 'Ann'): [('John', 'mother', 'Lillian'), ('Lillian', 'daughter', 'Ann')]}]
['mother', 'daughter']