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