[Jacob] took his son [Carl] to school this morning because he missed the bus. [Mary] has a son called [Jacob]. Each day they go to the park after school.
('Mary', 'Carl')
[Mary] has a son called [Jacob]. Each day they go to the park after school. [Jacob] took his son [Carl] to school this morning because he missed the bus.
[{('Mary', 'grandson', 'Carl'): [('Mary', 'son', 'Jacob'), ('Jacob', 'son', 'Carl')]}]