[Herman] asked his father, [Roy] to help him build a birdhouse. [Martha] and her father [Roy] went for a hike in the mountains.
('Martha', 'Herman')
[Martha] and her father [Roy] went for a hike in the mountains. [Herman] asked his father, [Roy] to help him build a birdhouse.
[{('Martha', 'brother', 'Herman'): [('Martha', 'father', 'Roy'), ('Roy', 'son', 'Herman')]}]