[Bobby] and his father [Antonio] played video games all day last Saturday. [Tracy] had lunch with her brother [Robert]. She told him about her son [Bobby] getting a scholarship. [Antonio] and his daughter, [Bettie] go to concerts every week.
('Robert', 'Bettie')
[Tracy] had lunch with her brother [Robert]. She told him about her son [Bobby] getting a scholarship. [Bobby] and his father [Antonio] played video games all day last Saturday. [Antonio] and his daughter, [Bettie] go to concerts every week.
[{('Robert', 'niece', 'Bettie'): [('Robert', 'sister', 'Tracy'), ('Tracy', 'daughter', 'Bettie')]}, {('Tracy', 'daughter', 'Bettie'): [('Tracy', 'son', 'Bobby'), ('Bobby', 'sister', 'Bettie')]}, {('Bobby', 'sister', 'Bettie'): [('Bobby', 'father', 'Antonio'), ('Antonio', 'daughter', 'Bettie')]}]
['sister', 'son', 'father', 'daughter']