[Lena] went out to lunch with her sister [David] and her son [Chris]. [Chris]'s aunt, [Cindy], was ten minutes late to his baseball game.
('David', 'Cindy')
[Lena] went out to lunch with her sister [David] and her son [Chris]. [Chris]'s aunt, [Cindy], was ten minutes late to his baseball game.
[{('David', 'sister', 'Cindy'): [('David', 'sister', 'Lena'), ('Lena', 'sister', 'Cindy')]}, {('Lena', 'sister', 'Cindy'): [('Lena', 'son', 'Chris'), ('Chris', 'aunt', 'Cindy')]}]
['sister', 'son', 'aunt']