[Antonio] was happy that his son [Bernardo] was doing well in college. [Dorothy] is a woman with a sister named [Tracy]. [Dorothy] and her son [Roberto] went to the zoo and then out to dinner yesterday. [Tracy] and her son [Bernardo] had lunch together at a local Chinese restaurant.
('Antonio', 'Roberto')
[Antonio] was happy that his son [Bernardo] was doing well in college. [Tracy] and her son [Bernardo] had lunch together at a local Chinese restaurant. [Dorothy] is a woman with a sister named [Tracy]. [Dorothy] and her son [Roberto] went to the zoo and then out to dinner yesterday.
[{('Antonio', 'nephew', 'Roberto'): [('Antonio', 'sister', 'Dorothy'), ('Dorothy', 'son', 'Roberto')]}, {('Antonio', 'sister', 'Dorothy'): [('Antonio', 'son', 'Bernardo'), ('Bernardo', 'aunt', 'Dorothy')]}, {('Bernardo', 'aunt', 'Dorothy'): [('Bernardo', 'mother', 'Tracy'), ('Tracy', 'sister', 'Dorothy')]}]
['son', 'mother', 'sister', 'son']