[Leonard] and his brother [Pete] went to visit [Leonard]'s grandmother [Frances] for Thanksgiving. [Pete] and her sister [Anna] decided to take a trip to Mexico together.
('Anna', 'Frances')
[Pete] and her sister [Anna] decided to take a trip to Mexico together. [Leonard] and his brother [Pete] went to visit [Leonard]'s grandmother [Frances] for Thanksgiving.
[{('Anna', 'grandmother', 'Frances'): [('Anna', 'brother', 'Leonard'), ('Leonard', 'grandmother', 'Frances')]}, {('Anna', 'brother', 'Leonard'): [('Anna', 'brother', 'Pete'), ('Pete', 'brother', 'Leonard')]}]
['brother', 'brother', 'grandmother']