[Heidi] borrowed some money from her brother [Robert]. [Jacob] called his brother [Robert] on the phone. He wanted to go out for some beers.
('Heidi', 'Jacob')
[Heidi] borrowed some money from her brother [Robert]. [Jacob] called his brother [Robert] on the phone. He wanted to go out for some beers.
[{('Heidi', 'brother', 'Jacob'): [('Heidi', 'brother', 'Robert'), ('Robert', 'brother', 'Jacob')]}]
['brother', 'brother']