[Amy]'s daughter [Mary] and [Amy]'s son [Michael] are planning a surprise birthday party for her.
('Michael', 'Mary')
[Amy]'s daughter [Mary] and [Amy]'s son [Michael] are planning a surprise birthday party for her.
[{('Michael', 'sister', 'Mary'): [('Michael', 'mother', 'Amy'), ('Amy', 'daughter', 'Mary')]}]
['mother', 'daughter']