[Stephanie] went to the park with her son [David] and after the park they went to visit [Roy] who is [Stephanie] father.
('Roy', 'David')
[Stephanie] went to the park with her son [David] and after the park they went to visit [Roy] who is [Stephanie] father.
[{('Roy', 'grandson', 'David'): [('Roy', 'daughter', 'Stephanie'), ('Stephanie', 'son', 'David')]}]