[Lena] looked all over the house for her son [Charles], but could n't find him. That's because [Charles] was outside in the back yard, playing baseball with his brother [Chris]. [Lena] and her daughter [Pamela] went out to dinner.
('Chris', 'Pamela')
[Lena] looked all over the house for her son [Charles], but could n't find him. That's because [Charles] was outside in the back yard, playing baseball with his brother [Chris]. [Lena] and her daughter [Pamela] went out to dinner.
[{('Chris', 'sister', 'Pamela'): [('Chris', 'brother', 'Charles'), ('Charles', 'sister', 'Pamela')]}, {('Charles', 'sister', 'Pamela'): [('Charles', 'mother', 'Lena'), ('Lena', 'daughter', 'Pamela')]}]
['brother', 'mother', 'daughter']