[Aaron]'s grandfather, [Harold], took the boy to the store to buy some new shoes. [Tracy]'s son, [Aaron], invited her brothers, [Pedro] and [Louis], to a surprise party.
('Louis', 'Harold')
[Tracy]'s son, [Aaron], invited her brothers, [Pedro] and [Louis], to a surprise party. [Aaron]'s grandfather, [Harold], took the boy to the store to buy some new shoes.
[{('Louis', 'father', 'Harold'): [('Louis', 'sister', 'Tracy'), ('Tracy', 'father', 'Harold')]}, {('Louis', 'sister', 'Tracy'): [('Louis', 'brother', 'Pedro'), ('Pedro', 'sister', 'Tracy')]}, {('Tracy', 'father', 'Harold'): [('Tracy', 'son', 'Aaron'), ('Aaron', 'grandfather', 'Harold')]}]
['brother', 'sister', 'son', 'grandfather']