[David] and her father [James] went for a hike in the mountains. [Bobby]'s mother [David] bought a Christmas gift for his sister, [Marie].
('Marie', 'James')
[Bobby]'s mother [David] bought a Christmas gift for his sister, [Marie]. [David] and her father [James] went for a hike in the mountains.
[{('Marie', 'grandfather', 'James'): [('Marie', 'mother', 'David'), ('David', 'father', 'James')]}, {('Marie', 'mother', 'David'): [('Marie', 'brother', 'Bobby'), ('Bobby', 'mother', 'David')]}]
['brother', 'mother', 'father']