[Timothy] went with his grandfather [Clarence] and brother [Douglas] to the park to play some baseball.
('Douglas', 'Clarence')
[Timothy] went with his grandfather [Clarence] and brother [Douglas] to the park to play some baseball.
[{('Douglas', 'grandfather', 'Clarence'): [('Douglas', 'brother', 'Timothy'), ('Timothy', 'grandfather', 'Clarence')]}]
['brother', 'grandfather']