[Lena] and her sister [David] went scuba diving. [Lena]'s daughter [Tina] did n't go because she ca n't swim. [James] read a bedtime story to his daughter [David].
('Tina', 'James')
[Lena] and her sister [David] went scuba diving. [Lena]'s daughter [Tina] did n't go because she ca n't swim. [James] read a bedtime story to his daughter [David].
[{('Tina', 'grandfather', 'James'): [('Tina', 'mother', 'Lena'), ('Lena', 'father', 'James')]}, {('Lena', 'father', 'James'): [('Lena', 'sister', 'David'), ('David', 'father', 'James')]}]
['mother', 'sister', 'father']