[Brent] made plans for brunch with his brother, [Franklin]. [Robert], his other brother, was sad he could n't make it.
('Robert', 'Franklin')
[Brent] made plans for brunch with his brother, [Franklin]. [Robert], his other brother, was sad he could n't make it.
[{('Robert', 'brother', 'Franklin'): [('Robert', 'brother', 'Brent'), ('Brent', 'brother', 'Franklin')]}]