[Leonard] likes to visit his grandmother [Frances]'s house on Sundays. [Cindy]'s son [Leonard] and son [Pete] went to the park together to play.
('Frances', 'Pete')
[Leonard] likes to visit his grandmother [Frances]'s house on Sundays. [Cindy]'s son [Leonard] and son [Pete] went to the park together to play.
[{('Frances', 'grandson', 'Pete'): [('Frances', 'grandson', 'Leonard'), ('Leonard', 'brother', 'Pete')]}, {('Leonard', 'brother', 'Pete'): [('Leonard', 'mother', 'Cindy'), ('Cindy', 'son', 'Pete')]}]
['grandson', 'mother', 'son']