[Mary] was playing in the sandbox with her brother [Dennis]. [Michael]'s sister, [Mary], was crying, so he told her a joke. She laughed, and felt better.
('Michael', 'Dennis')
[Michael]'s sister, [Mary], was crying, so he told her a joke. She laughed, and felt better. [Mary] was playing in the sandbox with her brother [Dennis].
[{('Michael', 'brother', 'Dennis'): [('Michael', 'sister', 'Mary'), ('Mary', 'brother', 'Dennis')]}]
['sister', 'brother']