[Charles] and his sister [Martha] went to the ice skating rink. [Charles] fell down and [Martha] laughed at him. [Wesley] took his daughter [Martha] out for ice cream. His other daughter, [Pamela], was still in school and could not go.
('Charles', 'Pamela')
[Charles] and his sister [Martha] went to the ice skating rink. [Charles] fell down and [Martha] laughed at him. [Wesley] took his daughter [Martha] out for ice cream. His other daughter, [Pamela], was still in school and could not go.
[{('Charles', 'sister', 'Pamela'): [('Charles', 'father', 'Wesley'), ('Wesley', 'daughter', 'Pamela')]}, {('Charles', 'father', 'Wesley'): [('Charles', 'sister', 'Martha'), ('Martha', 'father', 'Wesley')]}]
['sister', 'father', 'daughter']