[Glen] took his brother [Michael] to Las Vegas to go gambling. [Nicholas] and his son [Michael] went to the park to look for different kinds of birds.
('Glen', 'Nicholas')
[Glen] took his brother [Michael] to Las Vegas to go gambling. [Nicholas] and his son [Michael] went to the park to look for different kinds of birds.
[{('Glen', 'father', 'Nicholas'): [('Glen', 'brother', 'Michael'), ('Michael', 'father', 'Nicholas')]}]
['brother', 'father']