[Antonio] and his sister [Dorothy] went to brunch today at the new diner. [Antonio] and his sister [Beverly] got their mother [Beverly] a new computer for her birthday. She really liked it. [Robert] took his sister [Beverly] to the zoo. [Robert] 'son [Mario] did n't go because he is afraid of animals.
('Dorothy', 'Mario')
[Antonio] and his sister [Dorothy] went to brunch today at the new diner. [Antonio] and his sister [Beverly] got their mother [Beverly] a new computer for her birthday. She really liked it. [Robert] took his sister [Beverly] to the zoo. [Robert] 'son [Mario] did n't go because he is afraid of animals.
[{('Dorothy', 'nephew', 'Mario'): [('Dorothy', 'brother', 'Robert'), ('Robert', 'son', 'Mario')]}, {('Dorothy', 'brother', 'Robert'): [('Dorothy', 'brother', 'Antonio'), ('Antonio', 'brother', 'Robert')]}, {('Antonio', 'brother', 'Robert'): [('Antonio', 'sister', 'Beverly'), ('Beverly', 'brother', 'Robert')]}]
['brother', 'sister', 'brother', 'son']