[Clarence] has a lovely granddaughter. [April] is the name of his granddaughter. [Jerry] liked to play games with his sister, [April].
('Jerry', 'Clarence')
[Jerry] liked to play games with his sister, [April]. [Clarence] has a lovely granddaughter. [April] is the name of his granddaughter.
[{('Jerry', 'grandfather', 'Clarence'): [('Jerry', 'sister', 'April'), ('April', 'grandfather', 'Clarence')]}]
['sister', 'grandfather']