[Robert] is a very hot guy, but his sister [Beverly] is even more attractive. [Beverly] and her sister [Dorothy] played golf together. [Beverly] won easily. [Antonio] asked his father [Harold] if he could have a video game and he said okay. [Antonio]'s sister, [Dorothy], bought movie tickets at a discount rate.
('Harold', 'Robert')
[Antonio] asked his father [Harold] if he could have a video game and he said okay. [Antonio]'s sister, [Dorothy], bought movie tickets at a discount rate. [Beverly] and her sister [Dorothy] played golf together. [Beverly] won easily. [Robert] is a very hot guy, but his sister [Beverly] is even more attractive.
[{('Harold', 'son', 'Robert'): [('Harold', 'daughter', 'Beverly'), ('Beverly', 'brother', 'Robert')]}, {('Harold', 'daughter', 'Beverly'): [('Harold', 'son', 'Antonio'), ('Antonio', 'sister', 'Beverly')]}, {('Antonio', 'sister', 'Beverly'): [('Antonio', 'sister', 'Dorothy'), ('Dorothy', 'sister', 'Beverly')]}]
['son', 'sister', 'sister', 'brother']