[John] and his son [Franklin] went to the park and saw [John]'s father [Roy] there with his dog.
('Franklin', 'Roy')
[John] and his son [Franklin] went to the park and saw [John]'s father [Roy] there with his dog.
[{('Franklin', 'grandfather', 'Roy'): [('Franklin', 'father', 'John'), ('John', 'father', 'Roy')]}]