[Pedro] took his daughter [Heather] out for ice cream. His other daughter, [Rebecca], was still in school and could not go. [Pedro] was present in the delivery room when his daughter [Cheryl] was born, but when his daughter [Rebecca] was born he was too sick.
('Heather', 'Cheryl')
[Pedro] took his daughter [Heather] out for ice cream. His other daughter, [Rebecca], was still in school and could not go. [Pedro] was present in the delivery room when his daughter [Cheryl] was born, but when his daughter [Rebecca] was born he was too sick.
[{('Heather', 'sister', 'Cheryl'): [('Heather', 'sister', 'Rebecca'), ('Rebecca', 'sister', 'Cheryl')]}, {('Heather', 'sister', 'Rebecca'): [('Heather', 'father', 'Pedro'), ('Pedro', 'daughter', 'Rebecca')]}, {('Rebecca', 'sister', 'Cheryl'): [('Rebecca', 'father', 'Pedro'), ('Pedro', 'daughter', 'Cheryl')]}]
['father', 'daughter', 'father', 'daughter']