[Nancy] and her sister [Lillian] played golf together. [Nancy] won easily. [Lillian] had to pick her son [Jerry] up from school because the schools' bus was broke down.
('Jerry', 'Nancy')
[Lillian] had to pick her son [Jerry] up from school because the schools' bus was broke down. [Nancy] and her sister [Lillian] played golf together. [Nancy] won easily.
[{('Jerry', 'aunt', 'Nancy'): [('Jerry', 'mother', 'Lillian'), ('Lillian', 'sister', 'Nancy')]}]
['mother', 'sister']