[Lillian] and her sister [Amy] braided each other's hair before school. [Michael] gave his mother [Amy] flowers on her birthday.
('Michael', 'Lillian')
[Michael] gave his mother [Amy] flowers on her birthday. [Lillian] and her sister [Amy] braided each other's hair before school.
[{('Michael', 'aunt', 'Lillian'): [('Michael', 'mother', 'Amy'), ('Amy', 'sister', 'Lillian')]}]
['mother', 'sister']