[Douglas] and his brother [John] went to the football game together. [Timothy] and his brother [Douglas] went out for lunch. [Timothy] had a burger, and [Douglas] had a chicken sandwich.
('Timothy', 'John')
[Timothy] and his brother [Douglas] went out for lunch. [Timothy] had a burger, and [Douglas] had a chicken sandwich. [Douglas] and his brother [John] went to the football game together.
[{('Timothy', 'brother', 'John'): [('Timothy', 'brother', 'Douglas'), ('Douglas', 'brother', 'John')]}]
['brother', 'brother']