[Tracy] called [Marie], her sister, to see if she wanted to go out to eat. [Louis] and his brother [Pedro] fight a lot. Despite this, they still love each other very much. [Harold] bought a book for his son [Louis]. [Pedro] and her sister [Tracy] decided to take a trip to Mexico together.
('Marie', 'Harold')
[Tracy] called [Marie], her sister, to see if she wanted to go out to eat. [Pedro] and her sister [Tracy] decided to take a trip to Mexico together. [Louis] and his brother [Pedro] fight a lot. Despite this, they still love each other very much. [Harold] bought a book for his son [Louis].
[{('Marie', 'father', 'Harold'): [('Marie', 'brother', 'Louis'), ('Louis', 'father', 'Harold')]}, {('Marie', 'brother', 'Louis'): [('Marie', 'sister', 'Tracy'), ('Tracy', 'brother', 'Louis')]}, {('Tracy', 'brother', 'Louis'): [('Tracy', 'brother', 'Pedro'), ('Pedro', 'brother', 'Louis')]}]
['sister', 'brother', 'brother', 'father']