[Robert] always looked up to his big brother [Jacob] and wanted to be just like him. [Jeff] love his brother [Robert]. They are always playing together.
('Jacob', 'Jeff')
[Robert] always looked up to his big brother [Jacob] and wanted to be just like him. [Jeff] love his brother [Robert]. They are always playing together.
[{('Jacob', 'brother', 'Jeff'): [('Jacob', 'brother', 'Robert'), ('Robert', 'brother', 'Jeff')]}]
['brother', 'brother']