[Cindy] called [David], her sister, to see if she wanted to go out to eat. [David] decided to take a walk with her son [Brandon] after dinner. [Brandon]'s brother [Bobby] did n't feel like walking so he stayed at home.
('Bobby', 'Cindy')
[David] decided to take a walk with her son [Brandon] after dinner. [Brandon]'s brother [Bobby] did n't feel like walking so he stayed at home. [Cindy] called [David], her sister, to see if she wanted to go out to eat.
[{('Bobby', 'aunt', 'Cindy'): [('Bobby', 'mother', 'David'), ('David', 'sister', 'Cindy')]}, {('Bobby', 'mother', 'David'): [('Bobby', 'brother', 'Brandon'), ('Brandon', 'mother', 'David')]}]
['brother', 'mother', 'sister']