[Heather] took her father [Pedro] out for his birthday. They had a wonderful time. [Pedro] has a daughter named [Annie] who visits him every Sunday for dinner. [Rebecca] went to the store with her sister [Heather]. Later that day, [Rebecca] had tea with her sister [Cheryl].
('Cheryl', 'Annie')
[Rebecca] went to the store with her sister [Heather]. Later that day, [Rebecca] had tea with her sister [Cheryl]. [Heather] took her father [Pedro] out for his birthday. They had a wonderful time. [Pedro] has a daughter named [Annie] who visits him every Sunday for dinner.
[{('Cheryl', 'sister', 'Annie'): [('Cheryl', 'sister', 'Rebecca'), ('Rebecca', 'sister', 'Annie')]}, {('Rebecca', 'sister', 'Annie'): [('Rebecca', 'sister', 'Heather'), ('Heather', 'sister', 'Annie')]}, {('Heather', 'sister', 'Annie'): [('Heather', 'father', 'Pedro'), ('Pedro', 'daughter', 'Annie')]}]
['sister', 'sister', 'father', 'daughter']