[Robert]'s son [Mario] is in the hospital. [Mario]'s brother [Ronald] accidentally hit him with a hammer. [Antonio] bought ice cream for [Ronald]'s birthday. [Antonio] and his sister [Dorothy] went to the ice skating rink. [Antonio] fell down and [Dorothy] laughed at him.
('Robert', 'Dorothy')
[Robert]'s son [Mario] is in the hospital. [Mario]'s brother [Ronald] accidentally hit him with a hammer. [Antonio] bought ice cream for [Ronald]'s birthday. [Antonio] and his sister [Dorothy] went to the ice skating rink. [Antonio] fell down and [Dorothy] laughed at him.
[{('Robert', 'sister', 'Dorothy'): [('Robert', 'brother', 'Antonio'), ('Antonio', 'sister', 'Dorothy')]}, {('Robert', 'brother', 'Antonio'): [('Robert', 'son', 'Ronald'), ('Ronald', 'uncle', 'Antonio')]}, {('Robert', 'son', 'Ronald'): [('Robert', 'son', 'Mario'), ('Mario', 'brother', 'Ronald')]}]
['son', 'brother', 'uncle', 'sister']