[David] and her sister [Lynn] went out to lunch with [David]'s sister [Lena]. [Frances] told her daughter [Lena] to wash up. Dinner was ready.
('Frances', 'Lynn')
[Frances] told her daughter [Lena] to wash up. Dinner was ready. [David] and her sister [Lynn] went out to lunch with [David]'s sister [Lena].
[{('Frances', 'daughter', 'Lynn'): [('Frances', 'daughter', 'David'), ('David', 'sister', 'Lynn')]}, {('Frances', 'daughter', 'David'): [('Frances', 'daughter', 'Lena'), ('Lena', 'sister', 'David')]}]
['daughter', 'sister', 'sister']