[Hugh] took his son [Michael] fishing. [Hugh] and [Michael] stopped to give [Michael]'s sister, [Marie], some fish. [Johnson] and his sister [Marie] walked to school together every day, since they only lived two blocks away from the school.
('Johnson', 'Hugh')
[Johnson] and his sister [Marie] walked to school together every day, since they only lived two blocks away from the school. [Hugh] took his son [Michael] fishing. [Hugh] and [Michael] stopped to give [Michael]'s sister, [Marie], some fish.
[{('Johnson', 'father', 'Hugh'): [('Johnson', 'sister', 'Marie'), ('Marie', 'father', 'Hugh')]}, {('Marie', 'father', 'Hugh'): [('Marie', 'brother', 'Michael'), ('Michael', 'father', 'Hugh')]}]
['sister', 'brother', 'father']