[Cheryl] received a very nice letter from her grandfather [Harold]. [Cheryl]'s sister, [Heather], recently started acting. [Annie] and her sister [Rebecca] have never been close. Still, they love each other because they are family. [Heather] called [Annie], her sister, to see if she wanted to go out to eat.
('Rebecca', 'Harold')
[Annie] and her sister [Rebecca] have never been close. Still, they love each other because they are family. [Heather] called [Annie], her sister, to see if she wanted to go out to eat. [Cheryl]'s sister, [Heather], recently started acting. [Cheryl] received a very nice letter from her grandfather [Harold].
[{('Rebecca', 'grandfather', 'Harold'): [('Rebecca', 'sister', 'Annie'), ('Annie', 'grandfather', 'Harold')]}, {('Annie', 'grandfather', 'Harold'): [('Annie', 'sister', 'Cheryl'), ('Cheryl', 'grandfather', 'Harold')]}, {('Annie', 'sister', 'Cheryl'): [('Annie', 'sister', 'Heather'), ('Heather', 'sister', 'Cheryl')]}]
['sister', 'sister', 'sister', 'grandfather']