[Pedro] took his daughter [Annie] to the bookstore, and bought her some books from her favorite author. [Cheryl] and her sister [Annie] have never been close. Still, they love each other because they are family. [Rebecca] took her father [Pedro] out to dinner for Father's Day. [Cheryl] was talking about food with her sister [Heather].
('Rebecca', 'Heather')
[Rebecca] took her father [Pedro] out to dinner for Father's Day. [Pedro] took his daughter [Annie] to the bookstore, and bought her some books from her favorite author. [Cheryl] and her sister [Annie] have never been close. Still, they love each other because they are family. [Cheryl] was talking about food with her sister [Heather].
[{('Rebecca', 'sister', 'Heather'): [('Rebecca', 'sister', 'Annie'), ('Annie', 'sister', 'Heather')]}, {('Rebecca', 'sister', 'Annie'): [('Rebecca', 'father', 'Pedro'), ('Pedro', 'daughter', 'Annie')]}, {('Annie', 'sister', 'Heather'): [('Annie', 'sister', 'Cheryl'), ('Cheryl', 'sister', 'Heather')]}]
['father', 'daughter', 'sister', 'sister']