[Harold] decided to take his son, [Antonio], on a ski vacation. [Tracy] and her two brothers, [Robert] and [Louis] went to the fair. Her other brother [Antonio] was not able to go.
('Harold', 'Robert')
[Harold] decided to take his son, [Antonio], on a ski vacation. [Tracy] and her two brothers, [Robert] and [Louis] went to the fair. Her other brother [Antonio] was not able to go.
[{('Harold', 'son', 'Robert'): [('Harold', 'daughter', 'Tracy'), ('Tracy', 'brother', 'Robert')]}, {('Harold', 'daughter', 'Tracy'): [('Harold', 'son', 'Louis'), ('Louis', 'sister', 'Tracy')]}, {('Harold', 'son', 'Louis'): [('Harold', 'son', 'Antonio'), ('Antonio', 'brother', 'Louis')]}]
['son', 'brother', 'sister', 'brother']