[Lena] took her daughter [Pamela] to school during the cold winter morning. [Chris]'s sister [Martha] and mother [Lena] had dinner together at a local diner.
('Pamela', 'Martha')
[Lena] took her daughter [Pamela] to school during the cold winter morning. [Chris]'s sister [Martha] and mother [Lena] had dinner together at a local diner.
[{('Pamela', 'sister', 'Martha'): [('Pamela', 'mother', 'Lena'), ('Lena', 'daughter', 'Martha')]}, {('Lena', 'daughter', 'Martha'): [('Lena', 'son', 'Chris'), ('Chris', 'sister', 'Martha')]}]
['mother', 'son', 'sister']