[Harold] went on a road trip with his sons [Robert] and [Louis] to visit [Robert]'s daughter [Angelica] at college [Pedro] took his niece [Angelica] fishing Saturday. They caught a couple small fish.
('Louis', 'Pedro')
[Harold] went on a road trip with his sons [Robert] and [Louis] to visit [Robert]'s daughter [Angelica] at college [Pedro] took his niece [Angelica] fishing Saturday. They caught a couple small fish.
[{('Louis', 'brother', 'Pedro'): [('Louis', 'brother', 'Robert'), ('Robert', 'brother', 'Pedro')]}, {('Robert', 'brother', 'Pedro'): [('Robert', 'daughter', 'Angelica'), ('Angelica', 'uncle', 'Pedro')]}, {('Louis', 'brother', 'Robert'): [('Louis', 'father', 'Harold'), ('Harold', 'son', 'Robert')]}]
['father', 'son', 'daughter', 'uncle']