[Antonio] drove his daughters [Erika] and [Bettie] to school. [Bettie] is a sister of [Aaron]. [Bobby] and his sister [Erika] stood in line at the fair.
('Aaron', 'Bobby')
[Bettie] is a sister of [Aaron]. [Antonio] drove his daughters [Erika] and [Bettie] to school. [Bobby] and his sister [Erika] stood in line at the fair.
[{('Aaron', 'brother', 'Bobby'): [('Aaron', 'sister', 'Bettie'), ('Bettie', 'brother', 'Bobby')]}, {('Bettie', 'brother', 'Bobby'): [('Bettie', 'sister', 'Erika'), ('Erika', 'brother', 'Bobby')]}, {('Bettie', 'sister', 'Erika'): [('Bettie', 'father', 'Antonio'), ('Antonio', 'daughter', 'Erika')]}]
['sister', 'father', 'daughter', 'brother']