[Mildred] asked her sister [Pamela] to hurry up and get off the phone. [Mildred]'s sister [Tina] told her to wait her turn and be more patient. [Tina]'s grandmother [Frances] baked cookies for her after she came home from school.
('Pamela', 'Frances')
[Mildred] asked her sister [Pamela] to hurry up and get off the phone. [Mildred]'s sister [Tina] told her to wait her turn and be more patient. [Tina]'s grandmother [Frances] baked cookies for her after she came home from school.
[{('Pamela', 'grandmother', 'Frances'): [('Pamela', 'sister', 'Tina'), ('Tina', 'grandmother', 'Frances')]}, {('Pamela', 'sister', 'Tina'): [('Pamela', 'sister', 'Mildred'), ('Mildred', 'sister', 'Tina')]}]
['sister', 'sister', 'grandmother']