[George] took his daughter [Andrea] to the candy store. [Andrea]'s sister [Janet] was at the dentist because she had a cavity.
('Janet', 'George')
[George] took his daughter [Andrea] to the candy store. [Andrea]'s sister [Janet] was at the dentist because she had a cavity.
[{('Janet', 'father', 'George'): [('Janet', 'sister', 'Andrea'), ('Andrea', 'father', 'George')]}]
['sister', 'father']