[Lena] and her daughter [Martha] went out for ice cream. [Lena] got a cone and [Martha] got a sundae. [Lena] took her daughter, [Pamela], to lunch. [Frances] took her granddaughter [Martha] on a long walk during the pretty spring day.
('Pamela', 'Frances')
[Lena] took her daughter, [Pamela], to lunch. [Lena] and her daughter [Martha] went out for ice cream. [Lena] got a cone and [Martha] got a sundae. [Frances] took her granddaughter [Martha] on a long walk during the pretty spring day.
[{('Pamela', 'grandmother', 'Frances'): [('Pamela', 'sister', 'Martha'), ('Martha', 'grandmother', 'Frances')]}, {('Pamela', 'sister', 'Martha'): [('Pamela', 'mother', 'Lena'), ('Lena', 'daughter', 'Martha')]}]
['mother', 'daughter', 'grandmother']