[Frances] wanted to buy something nice for her granddaughter [Martha]. [Frances] called [Martha]'s sister [Pamela] for a suggestion. [Chris] borrowed some money from his sister [Pamela].
('Chris', 'Frances')
[Chris] borrowed some money from his sister [Pamela]. [Frances] wanted to buy something nice for her granddaughter [Martha]. [Frances] called [Martha]'s sister [Pamela] for a suggestion.
[{('Chris', 'grandmother', 'Frances'): [('Chris', 'sister', 'Pamela'), ('Pamela', 'grandmother', 'Frances')]}, {('Pamela', 'grandmother', 'Frances'): [('Pamela', 'sister', 'Martha'), ('Martha', 'grandmother', 'Frances')]}]
['sister', 'sister', 'grandmother']