[Leonard] called his brother [Richard] on Friday because it was his birthday. [Frances] and her grandson [Leonard] went to the zoo. [Leonard] wanted to see the lions. [Pete] and his brother [Richard] went to the park. They threw a ball around and played with their dog.
('Frances', 'Pete')
[Frances] and her grandson [Leonard] went to the zoo. [Leonard] wanted to see the lions. [Leonard] called his brother [Richard] on Friday because it was his birthday. [Pete] and his brother [Richard] went to the park. They threw a ball around and played with their dog.
[{('Frances', 'grandson', 'Pete'): [('Frances', 'grandson', 'Leonard'), ('Leonard', 'brother', 'Pete')]}, {('Leonard', 'brother', 'Pete'): [('Leonard', 'brother', 'Richard'), ('Richard', 'brother', 'Pete')]}]
['grandson', 'brother', 'brother']