[Frances] loves her grandson [Charles]. [Charles] loves her, too. [Pamela] and her brother [Chris] watched TV together. [Charles] was invited to watch too, because [Pamela] is his sister.
('Frances', 'Chris')
[Frances] loves her grandson [Charles]. [Charles] loves her, too. [Pamela] and her brother [Chris] watched TV together. [Charles] was invited to watch too, because [Pamela] is his sister.
[{('Frances', 'grandson', 'Chris'): [('Frances', 'granddaughter', 'Pamela'), ('Pamela', 'brother', 'Chris')]}, {('Frances', 'granddaughter', 'Pamela'): [('Frances', 'grandson', 'Charles'), ('Charles', 'sister', 'Pamela')]}]
['grandson', 'sister', 'brother']