[Thomas] and his sister [Dolores] took their father out to eat for his birthday. They had a great time. [James] took his grandson [Clarence] to the mall. [Clarence]'s sister [Dolores] was jealous.
('Thomas', 'James')
[Thomas] and his sister [Dolores] took their father out to eat for his birthday. They had a great time. [James] took his grandson [Clarence] to the mall. [Clarence]'s sister [Dolores] was jealous.
[{('Thomas', 'grandfather', 'James'): [('Thomas', 'sister', 'Dolores'), ('Dolores', 'grandfather', 'James')]}, {('Dolores', 'grandfather', 'James'): [('Dolores', 'brother', 'Clarence'), ('Clarence', 'grandfather', 'James')]}]
['sister', 'brother', 'grandfather']