[Charles] wanted to buy his mother, [Lena], a birthday present. But he did n't know what to get her. [Francisco] took his sisters [Lynn] and [Lena] on a hiking trip last weekend.
('Charles', 'Lynn')
[Charles] wanted to buy his mother, [Lena], a birthday present. But he did n't know what to get her. [Francisco] took his sisters [Lynn] and [Lena] on a hiking trip last weekend.
[{('Charles', 'aunt', 'Lynn'): [('Charles', 'mother', 'Lena'), ('Lena', 'sister', 'Lynn')]}, {('Lena', 'sister', 'Lynn'): [('Lena', 'brother', 'Francisco'), ('Francisco', 'sister', 'Lynn')]}]
['mother', 'brother', 'sister']