[Clarence] took his granddaughter [Emily] to the circus. Her sister, [Mary], was jealous.
('Mary', 'Clarence')
[Clarence] took his granddaughter [Emily] to the circus. Her sister, [Mary], was jealous.
[{('Mary', 'grandfather', 'Clarence'): [('Mary', 'sister', 'Emily'), ('Emily', 'grandfather', 'Clarence')]}]
['sister', 'grandfather']