[Martha] went shopping at the mall with her mother [Lena] [Tina] was playing hide-and-seek with her sister [Martha]. [James] and his daughter [Lena] like to read poems together.
('Tina', 'James')
[Tina] was playing hide-and-seek with her sister [Martha]. [Martha] went shopping at the mall with her mother [Lena] [James] and his daughter [Lena] like to read poems together.
[{('Tina', 'grandfather', 'James'): [('Tina', 'sister', 'Martha'), ('Martha', 'grandfather', 'James')]}, {('Martha', 'grandfather', 'James'): [('Martha', 'mother', 'Lena'), ('Lena', 'father', 'James')]}]
['sister', 'mother', 'father']