[April] called [Janet], her sister, to see if she wanted to go out to eat. [Janet]'s grandfather [Clarence] bought a chocolate cake for her birthday.
('Clarence', 'April')
[Janet]'s grandfather [Clarence] bought a chocolate cake for her birthday. [April] called [Janet], her sister, to see if she wanted to go out to eat.
[{('Clarence', 'granddaughter', 'April'): [('Clarence', 'granddaughter', 'Janet'), ('Janet', 'sister', 'April')]}]
['granddaughter', 'sister']