[Bobby] asked his father [Antonio] if they could go to the library. [Antonio]'s father [Harold] was there already, waiting for them. [Robert] borrowed some money from his sister [Tracy]. [Tracy] was unhappy with her son, [Bobby], and his grades. She enlisted a tutor to help him.
('Robert', 'Harold')
[Robert] borrowed some money from his sister [Tracy]. [Tracy] was unhappy with her son, [Bobby], and his grades. She enlisted a tutor to help him. [Bobby] asked his father [Antonio] if they could go to the library. [Antonio]'s father [Harold] was there already, waiting for them.
[{('Robert', 'father', 'Harold'): [('Robert', 'sister', 'Tracy'), ('Tracy', 'father', 'Harold')]}, {('Tracy', 'father', 'Harold'): [('Tracy', 'son', 'Bobby'), ('Bobby', 'grandfather', 'Harold')]}, {('Bobby', 'grandfather', 'Harold'): [('Bobby', 'father', 'Antonio'), ('Antonio', 'father', 'Harold')]}]
['sister', 'son', 'father', 'father']