[Lillian] takes her daughter [Ann] to the movies for her birthday. [Ann]'s sister [Andrea] ca n't come too since she has to work.
('Andrea', 'Lillian')
[Lillian] takes her daughter [Ann] to the movies for her birthday. [Ann]'s sister [Andrea] ca n't come too since she has to work.
[{('Andrea', 'mother', 'Lillian'): [('Andrea', 'sister', 'Ann'), ('Ann', 'mother', 'Lillian')]}]
['sister', 'mother']