[Annie] took her sister [Rebecca] out for dinner to celebrate her birthday. [Antonio] asked his father, [Harold], to help him with his math homework. [Harold] could n't, because he was lousy at math himself. [Antonio] and his brother [Pedro] went to see a baseball game on Friday and had a great time. [Pedro] made a pizza for his daughter. Her name is [Annie].
('Rebecca', 'Harold')
[Annie] took her sister [Rebecca] out for dinner to celebrate her birthday. [Pedro] made a pizza for his daughter. Her name is [Annie]. [Antonio] and his brother [Pedro] went to see a baseball game on Friday and had a great time. [Antonio] asked his father, [Harold], to help him with his math homework. [Harold] could n't, because he was lousy at math himself.
[{('Rebecca', 'grandfather', 'Harold'): [('Rebecca', 'sister', 'Annie'), ('Annie', 'grandfather', 'Harold')]}, {('Annie', 'grandfather', 'Harold'): [('Annie', 'father', 'Pedro'), ('Pedro', 'father', 'Harold')]}, {('Pedro', 'father', 'Harold'): [('Pedro', 'brother', 'Antonio'), ('Antonio', 'father', 'Harold')]}]
['sister', 'father', 'brother', 'father']