[Hugh] took his father, [James], to a baseball game downtown. They invited [Brandon] along, because [Hugh] is [Brandon]'s father. [David] took her son, [Brandon], to go get baked goods from the local bakery.
('David', 'James')
[David] took her son, [Brandon], to go get baked goods from the local bakery. [Hugh] took his father, [James], to a baseball game downtown. They invited [Brandon] along, because [Hugh] is [Brandon]'s father.
[{('David', 'father', 'James'): [('David', 'son', 'Brandon'), ('Brandon', 'grandfather', 'James')]}, {('Brandon', 'grandfather', 'James'): [('Brandon', 'father', 'Hugh'), ('Hugh', 'father', 'James')]}]
['son', 'father', 'father']