[Martha] was mad at her brother [Chris], because [Chris] had called her fat. [Chris]'s sister [Tina] did not want to go shopping but her grandmother [Frances] forced her to.
('Martha', 'Frances')
[Martha] was mad at her brother [Chris], because [Chris] had called her fat. [Chris]'s sister [Tina] did not want to go shopping but her grandmother [Frances] forced her to.
[{('Martha', 'grandmother', 'Frances'): [('Martha', 'sister', 'Tina'), ('Tina', 'grandmother', 'Frances')]}, {('Martha', 'sister', 'Tina'): [('Martha', 'brother', 'Chris'), ('Chris', 'sister', 'Tina')]}]
['brother', 'sister', 'grandmother']