[Clarence] bought his granddaughter [Heidi] a new car. [Heidi]'s sister [Louise] was so jealous.
('Clarence', 'Louise')
[Clarence] bought his granddaughter [Heidi] a new car. [Heidi]'s sister [Louise] was so jealous.
[{('Clarence', 'granddaughter', 'Louise'): [('Clarence', 'granddaughter', 'Heidi'), ('Heidi', 'sister', 'Louise')]}]
['granddaughter', 'sister']