[Roy] and his son [John] went to the park to look for different kinds of birds. [Margaret] called her dad [John] to pick her up from school.
('Margaret', 'Roy')
[Margaret] called her dad [John] to pick her up from school. [Roy] and his son [John] went to the park to look for different kinds of birds.
[{('Margaret', 'grandfather', 'Roy'): [('Margaret', 'father', 'John'), ('John', 'father', 'Roy')]}]