[Louis] and his brother [Pedro] played at jacks. [Antonio] went out for pizza with his daughter [Erika] and his brother [Pedro]. [Marie] was eager to see her niece, [Erika]. They had n't seen each other in ages
('Louis', 'Marie')
[Louis] and his brother [Pedro] played at jacks. [Antonio] went out for pizza with his daughter [Erika] and his brother [Pedro]. [Marie] was eager to see her niece, [Erika]. They had n't seen each other in ages
[{('Louis', 'sister', 'Marie'): [('Louis', 'brother', 'Antonio'), ('Antonio', 'sister', 'Marie')]}, {('Louis', 'brother', 'Antonio'): [('Louis', 'brother', 'Pedro'), ('Pedro', 'brother', 'Antonio')]}, {('Antonio', 'sister', 'Marie'): [('Antonio', 'daughter', 'Erika'), ('Erika', 'aunt', 'Marie')]}]
['brother', 'brother', 'daughter', 'aunt']