[Karen] was playing in the sandbox with her brother [Samuel]. [Beverly] went out for pizza with her father [Harold]. [Beverly] could n't wait to get off the plane to see her mother, [Nettie]. [Nettie] and her brother [Samuel] went to the diner to eat yummy food together.
('Karen', 'Harold')
[Karen] was playing in the sandbox with her brother [Samuel]. [Nettie] and her brother [Samuel] went to the diner to eat yummy food together. [Beverly] could n't wait to get off the plane to see her mother, [Nettie]. [Beverly] went out for pizza with her father [Harold].
[{('Karen', 'grandfather', 'Harold'): [('Karen', 'sister', 'Nettie'), ('Nettie', 'grandfather', 'Harold')]}, {('Karen', 'sister', 'Nettie'): [('Karen', 'brother', 'Samuel'), ('Samuel', 'sister', 'Nettie')]}, {('Nettie', 'grandfather', 'Harold'): [('Nettie', 'mother', 'Beverly'), ('Beverly', 'father', 'Harold')]}]
['brother', 'sister', 'mother', 'father']