[Pedro] walked his daughters [Heather] and [Rebecca] to school. [Dorothy] and her daughter [Cheryl] went out to dinner. [Dorothy] and her daughter [Heather] went shopping together last Monday and they bought new shoes for [Dorothy]'s kids.
('Rebecca', 'Cheryl')
[Pedro] walked his daughters [Heather] and [Rebecca] to school. [Dorothy] and her daughter [Heather] went shopping together last Monday and they bought new shoes for [Dorothy]'s kids. [Dorothy] and her daughter [Cheryl] went out to dinner.
[{('Rebecca', 'sister', 'Cheryl'): [('Rebecca', 'mother', 'Dorothy'), ('Dorothy', 'daughter', 'Cheryl')]}, {('Rebecca', 'mother', 'Dorothy'): [('Rebecca', 'sister', 'Heather'), ('Heather', 'mother', 'Dorothy')]}, {('Rebecca', 'sister', 'Heather'): [('Rebecca', 'father', 'Pedro'), ('Pedro', 'daughter', 'Heather')]}]
['father', 'daughter', 'mother', 'daughter']