[Antonio] went to dinner with daughter [Erika] and his father [Harold]. [Tracy] invited her brother [Robert] to her daughter [Erika]'s engagement party.
('Harold', 'Robert')
[Antonio] went to dinner with daughter [Erika] and his father [Harold]. [Tracy] invited her brother [Robert] to her daughter [Erika]'s engagement party.
[{('Harold', 'son', 'Robert'): [('Harold', 'son', 'Antonio'), ('Antonio', 'brother', 'Robert')]}, {('Antonio', 'brother', 'Robert'): [('Antonio', 'daughter', 'Erika'), ('Erika', 'uncle', 'Robert')]}, {('Erika', 'uncle', 'Robert'): [('Erika', 'mother', 'Tracy'), ('Tracy', 'brother', 'Robert')]}]
['son', 'daughter', 'mother', 'brother']