[Pedro] needed someone to help him move out of his dorm last May. He asked his brother [Robert] and he said he would help him. [Robert] and his son [Ronald] went to the skating rink. [Tracy] and her sister [Marie] went to the movies. [Marie]'s son [Ronald] stayed home with a cold.
('Tracy', 'Pedro')
[Tracy] and her sister [Marie] went to the movies. [Marie]'s son [Ronald] stayed home with a cold. [Robert] and his son [Ronald] went to the skating rink. [Pedro] needed someone to help him move out of his dorm last May. He asked his brother [Robert] and he said he would help him.
[{('Tracy', 'brother', 'Pedro'): [('Tracy', 'sister', 'Marie'), ('Marie', 'brother', 'Pedro')]}, {('Marie', 'brother', 'Pedro'): [('Marie', 'son', 'Ronald'), ('Ronald', 'uncle', 'Pedro')]}, {('Ronald', 'uncle', 'Pedro'): [('Ronald', 'father', 'Robert'), ('Robert', 'brother', 'Pedro')]}]
['sister', 'son', 'father', 'brother']