[Lena] and her daughter [Mildred] are entering the competition together. [Lena] asked her Daughter [Pamela] to take the dogs for a walk. [Pamela] asked her sister [Martha] to accompany her.
('Martha', 'Mildred')
[Lena] asked her Daughter [Pamela] to take the dogs for a walk. [Pamela] asked her sister [Martha] to accompany her. [Lena] and her daughter [Mildred] are entering the competition together.
[{('Martha', 'sister', 'Mildred'): [('Martha', 'sister', 'Pamela'), ('Pamela', 'sister', 'Mildred')]}, {('Pamela', 'sister', 'Mildred'): [('Pamela', 'mother', 'Lena'), ('Lena', 'daughter', 'Mildred')]}]
['sister', 'mother', 'daughter']