[Jacob] wanted to teach his son [Carl] to play football. So [Jacob] asked his brother [John] to come help teach him.
('Carl', 'John')
[Jacob] wanted to teach his son [Carl] to play football. So [Jacob] asked his brother [John] to come help teach him.
[{('Carl', 'uncle', 'John'): [('Carl', 'father', 'Jacob'), ('Jacob', 'brother', 'John')]}]