[Angelica] went on a vacation with her brother [Mario]. [Robert] and his wife [Marie] washed the car with their son [Mario]. [Marie]'s son [Ronald] did n't help at all.
('Angelica', 'Ronald')
[Angelica] went on a vacation with her brother [Mario]. [Robert] and his wife [Marie] washed the car with their son [Mario]. [Marie]'s son [Ronald] did n't help at all.
[{('Angelica', 'brother', 'Ronald'): [('Angelica', 'mother', 'Marie'), ('Marie', 'son', 'Ronald')]}, {('Angelica', 'mother', 'Marie'): [('Angelica', 'brother', 'Mario'), ('Mario', 'mother', 'Marie')]}, {('Marie', 'son', 'Ronald'): [('Marie', 'husband', 'Robert'), ('Robert', 'son', 'Ronald')]}]
['brother', 'mother', 'husband', 'son']