[Harold] played catch with his son [Antonio]. [Harold]'s other son [Louis] does n't play baseball. [Emma]'s father [Antonio] is taking her to a movie because she got good grades. [Robert] took his niece [Emma] fishing Saturday. They caught a couple small fish.
('Louis', 'Robert')
[Harold] played catch with his son [Antonio]. [Harold]'s other son [Louis] does n't play baseball. [Emma]'s father [Antonio] is taking her to a movie because she got good grades. [Robert] took his niece [Emma] fishing Saturday. They caught a couple small fish.
[{('Louis', 'brother', 'Robert'): [('Louis', 'father', 'Harold'), ('Harold', 'son', 'Robert')]}, {('Harold', 'son', 'Robert'): [('Harold', 'son', 'Antonio'), ('Antonio', 'brother', 'Robert')]}, {('Antonio', 'brother', 'Robert'): [('Antonio', 'daughter', 'Emma'), ('Emma', 'uncle', 'Robert')]}]
['father', 'son', 'daughter', 'uncle']