[Dorothy] loved spending the day at the park with her brother [Antonio] and his son [Bobby] [Robert] invited his sister [Dorothy] to dinner. [Robert]'s brother [Louis] was too busy to attend.
('Louis', 'Bobby')
[Robert] invited his sister [Dorothy] to dinner. [Robert]'s brother [Louis] was too busy to attend. [Dorothy] loved spending the day at the park with her brother [Antonio] and his son [Bobby]
[{('Louis', 'nephew', 'Bobby'): [('Louis', 'brother', 'Antonio'), ('Antonio', 'son', 'Bobby')]}, {('Louis', 'brother', 'Antonio'): [('Louis', 'sister', 'Dorothy'), ('Dorothy', 'brother', 'Antonio')]}, {('Louis', 'sister', 'Dorothy'): [('Louis', 'brother', 'Robert'), ('Robert', 'sister', 'Dorothy')]}]
['brother', 'sister', 'brother', 'son']