[Tina] and her sister [Martha] were getting together this weekend so that they could go hiking together they had n't spent time together alone in a while. [James] and his daughter [Lena] went to the store. [Lena]'s child, [Tina] was already there waiting for them.
('Martha', 'James')
[Tina] and her sister [Martha] were getting together this weekend so that they could go hiking together they had n't spent time together alone in a while. [James] and his daughter [Lena] went to the store. [Lena]'s child, [Tina] was already there waiting for them.
[{('Martha', 'grandfather', 'James'): [('Martha', 'sister', 'Tina'), ('Tina', 'grandfather', 'James')]}, {('Tina', 'grandfather', 'James'): [('Tina', 'mother', 'Lena'), ('Lena', 'father', 'James')]}]
['sister', 'mother', 'father']