[Pete] and his sister [Wilhelmina] love to play video games. [Wilhelmina] and her sister [Anna] were playing with dolls. Suddenly, [Anna] decided that she needed to go check on her grandmother, [Frances].
('Pete', 'Frances')
[Pete] and his sister [Wilhelmina] love to play video games. [Wilhelmina] and her sister [Anna] were playing with dolls. Suddenly, [Anna] decided that she needed to go check on her grandmother, [Frances].
[{('Pete', 'grandmother', 'Frances'): [('Pete', 'sister', 'Wilhelmina'), ('Wilhelmina', 'grandmother', 'Frances')]}, {('Wilhelmina', 'grandmother', 'Frances'): [('Wilhelmina', 'sister', 'Anna'), ('Anna', 'grandmother', 'Frances')]}]
['sister', 'sister', 'grandmother']