[Amy] picked up her son [Michael] from the mall [Amy] took her son [Dennis] to school this morning because he missed the bus.
('Michael', 'Dennis')
[Amy] picked up her son [Michael] from the mall [Amy] took her son [Dennis] to school this morning because he missed the bus.
[{('Michael', 'brother', 'Dennis'): [('Michael', 'mother', 'Amy'), ('Amy', 'son', 'Dennis')]}]
['mother', 'son']