[Dorothy] and her daughter [Annie] went out to dinner. [Annie] called her mother [Dorothy] to let her know she will be back home soon. [Cheryl] and her sister [Heather] went out to lunch with [Cheryl]'s sister [Annie].
('Annie', 'Heather')
[Annie] called her mother [Dorothy] to let her know she will be back home soon. [Dorothy] and her daughter [Annie] went out to dinner. [Cheryl] and her sister [Heather] went out to lunch with [Cheryl]'s sister [Annie].
[{('Annie', 'sister', 'Heather'): [('Annie', 'mother', 'Dorothy'), ('Dorothy', 'daughter', 'Heather')]}, {('Dorothy', 'daughter', 'Heather'): [('Dorothy', 'daughter', 'Cheryl'), ('Cheryl', 'sister', 'Heather')]}, {('Dorothy', 'daughter', 'Cheryl'): [('Dorothy', 'daughter', 'Annie'), ('Annie', 'sister', 'Cheryl')]}]
['mother', 'daughter', 'sister', 'sister']