[Marie] drove her son [Ronald] to his soccer game. [Ronald]'s father has a sister named [Tracy]. [Erika] was so proud of her daughter, [Tracy]'s, accomplishments. [Erika] was glad her grandfather, [Harold], was happy, too.
('Marie', 'Harold')
[Marie] drove her son [Ronald] to his soccer game. [Ronald]'s father has a sister named [Tracy]. [Erika] was so proud of her daughter, [Tracy]'s, accomplishments. [Erika] was glad her grandfather, [Harold], was happy, too.
[{('Marie', 'father', 'Harold'): [('Marie', 'sister', 'Tracy'), ('Tracy', 'father', 'Harold')]}, {('Marie', 'sister', 'Tracy'): [('Marie', 'son', 'Ronald'), ('Ronald', 'aunt', 'Tracy')]}, {('Tracy', 'father', 'Harold'): [('Tracy', 'daughter', 'Erika'), ('Erika', 'grandfather', 'Harold')]}]
['son', 'aunt', 'daughter', 'grandfather']