[April] was watching TV with her grandfather [Clarence]. [Jerry] is going to the arcade with his sister, [April].
('Jerry', 'Clarence')
[Jerry] is going to the arcade with his sister, [April]. [April] was watching TV with her grandfather [Clarence].
[{('Jerry', 'grandfather', 'Clarence'): [('Jerry', 'sister', 'April'), ('April', 'grandfather', 'Clarence')]}]
['sister', 'grandfather']