[Lillian] took her sister [Amy] out for dinner to celebrate her birthday. [Michael] sent flowers to his mother [Amy] for Mother's Day.
('Michael', 'Lillian')
[Michael] sent flowers to his mother [Amy] for Mother's Day. [Lillian] took her sister [Amy] out for dinner to celebrate her birthday.
[{('Michael', 'aunt', 'Lillian'): [('Michael', 'mother', 'Amy'), ('Amy', 'sister', 'Lillian')]}]
['mother', 'sister']