[Paul]'s grandpa [Harold] taught him and his brother [Michael] how to hunt and fish when they were both still very young. [Louis] watched his son [Paul] play catch. [Paul] tossed the ball back and fourth with his brother [Michael].
('Louis', 'Harold')
[Louis] watched his son [Paul] play catch. [Paul] tossed the ball back and fourth with his brother [Michael]. [Paul]'s grandpa [Harold] taught him and his brother [Michael] how to hunt and fish when they were both still very young.
[{('Louis', 'father', 'Harold'): [('Louis', 'son', 'Michael'), ('Michael', 'grandfather', 'Harold')]}, {('Michael', 'grandfather', 'Harold'): [('Michael', 'brother', 'Paul'), ('Paul', 'grandfather', 'Harold')]}, {('Louis', 'son', 'Michael'): [('Louis', 'son', 'Paul'), ('Paul', 'brother', 'Michael')]}]
['son', 'brother', 'brother', 'grandfather']