[Erika] took her brother, [Aaron], and her father, [Antonio], out for dinner. [Antonio]'s mother, [Shantel], was supposed to come too, but she had a business meeting and could n't make it. [Tracy] took her son [Aaron] to the football game.
('Tracy', 'Shantel')
[Tracy] took her son [Aaron] to the football game. [Erika] took her brother, [Aaron], and her father, [Antonio], out for dinner. [Antonio]'s mother, [Shantel], was supposed to come too, but she had a business meeting and could n't make it.
[{('Tracy', 'mother', 'Shantel'): [('Tracy', 'daughter', 'Erika'), ('Erika', 'grandmother', 'Shantel')]}, {('Erika', 'grandmother', 'Shantel'): [('Erika', 'father', 'Antonio'), ('Antonio', 'mother', 'Shantel')]}, {('Tracy', 'daughter', 'Erika'): [('Tracy', 'son', 'Aaron'), ('Aaron', 'sister', 'Erika')]}]
['son', 'sister', 'father', 'mother']