[Cindy]'s son, [Richard], was busy with school activities and forgot to meet his sister. [Richard] was having an argument with her sister, [Carrie]. [Leonard] and his wife [Carrie] went to a lovely anniversary dinner.
('Cindy', 'Leonard')
[Cindy]'s son, [Richard], was busy with school activities and forgot to meet his sister. [Richard] was having an argument with her sister, [Carrie]. [Leonard] and his wife [Carrie] went to a lovely anniversary dinner.
[{('Cindy', 'son-in-law', 'Leonard'): [('Cindy', 'daughter', 'Carrie'), ('Carrie', 'husband', 'Leonard')]}, {('Cindy', 'daughter', 'Carrie'): [('Cindy', 'son', 'Richard'), ('Richard', 'sister', 'Carrie')]}]
['son', 'sister', 'husband']