[Timothy] and his brother [Jerry] were playing tag in the park. [Jerry] called his brother [Douglas] on Friday because it was his birthday.
('Timothy', 'Douglas')
[Timothy] and his brother [Jerry] were playing tag in the park. [Jerry] called his brother [Douglas] on Friday because it was his birthday.
[{('Timothy', 'brother', 'Douglas'): [('Timothy', 'brother', 'Jerry'), ('Jerry', 'brother', 'Douglas')]}]
['brother', 'brother']