[Pamela] asked her mom, [Lena], to watch the dog while she was away. [Pamela]'s brother, [Irvin], did it because he is better with dogs. [Lena] and her sister [David] braided each other's hair before school.
('David', 'Irvin')
[Lena] and her sister [David] braided each other's hair before school. [Pamela] asked her mom, [Lena], to watch the dog while she was away. [Pamela]'s brother, [Irvin], did it because he is better with dogs.
[{('David', 'nephew', 'Irvin'): [('David', 'sister', 'Lena'), ('Lena', 'son', 'Irvin')]}, {('Lena', 'son', 'Irvin'): [('Lena', 'daughter', 'Pamela'), ('Pamela', 'brother', 'Irvin')]}]
['sister', 'daughter', 'brother']