[Lynn] and her sister [Cindy] braided each other's hair before school. [David] was sewing a sweater for her sister [Lynn]. [Leonard] called his mother, [Cindy], to tell her the good news of his engagement.
('Leonard', 'David')
[Leonard] called his mother, [Cindy], to tell her the good news of his engagement. [Lynn] and her sister [Cindy] braided each other's hair before school. [David] was sewing a sweater for her sister [Lynn].
[{('Leonard', 'aunt', 'David'): [('Leonard', 'mother', 'Cindy'), ('Cindy', 'sister', 'David')]}, {('Cindy', 'sister', 'David'): [('Cindy', 'sister', 'Lynn'), ('Lynn', 'sister', 'David')]}]
['mother', 'sister', 'sister']