[James] has a son named [Hugh] that looks exactly like him. [David] took her son [Johnson] to school this morning because he missed the bus. [Hugh] and his son [Johnson] went to the park to look for different kinds of birds.
('David', 'James')
[David] took her son [Johnson] to school this morning because he missed the bus. [Hugh] and his son [Johnson] went to the park to look for different kinds of birds. [James] has a son named [Hugh] that looks exactly like him.
[{('David', 'father', 'James'): [('David', 'son', 'Johnson'), ('Johnson', 'grandfather', 'James')]}, {('Johnson', 'grandfather', 'James'): [('Johnson', 'father', 'Hugh'), ('Hugh', 'father', 'James')]}]
['son', 'father', 'father']