[Pedro] and his sister [Tracy] took their father out to eat for his birthday. They had a great time. [Annie]'s sister [Rebecca] helped her pick out a Father's Day gift for her father, [Pedro]. [Harold] taught his daughter, [Tracy], how to ride a bike.
('Rebecca', 'Harold')
[Annie]'s sister [Rebecca] helped her pick out a Father's Day gift for her father, [Pedro]. [Pedro] and his sister [Tracy] took their father out to eat for his birthday. They had a great time. [Harold] taught his daughter, [Tracy], how to ride a bike.
[{('Rebecca', 'grandfather', 'Harold'): [('Rebecca', 'father', 'Pedro'), ('Pedro', 'father', 'Harold')]}, {('Rebecca', 'father', 'Pedro'): [('Rebecca', 'sister', 'Annie'), ('Annie', 'father', 'Pedro')]}, {('Pedro', 'father', 'Harold'): [('Pedro', 'sister', 'Tracy'), ('Tracy', 'father', 'Harold')]}]
['sister', 'father', 'sister', 'father']