[Tracy]'s sister [Beverly] and son [Aaron] helped her pick out a Christmas gift for [Beverly]'s father, [Harold]. [Aaron] hit his brother [Bernardo] in the head.
('Bernardo', 'Harold')
[Aaron] hit his brother [Bernardo] in the head. [Tracy]'s sister [Beverly] and son [Aaron] helped her pick out a Christmas gift for [Beverly]'s father, [Harold].
[{('Bernardo', 'grandfather', 'Harold'): [('Bernardo', 'brother', 'Aaron'), ('Aaron', 'grandfather', 'Harold')]}, {('Aaron', 'grandfather', 'Harold'): [('Aaron', 'mother', 'Tracy'), ('Tracy', 'father', 'Harold')]}, {('Tracy', 'father', 'Harold'): [('Tracy', 'sister', 'Beverly'), ('Beverly', 'father', 'Harold')]}]
['brother', 'mother', 'sister', 'father']