[Frances] offered to take her grandson [Richard] to the park but [Richard] wanted to stay home and play cards with his sister [Carrie] instead. [Carrie] took her younger sister [Natasha] to the carnival last weekend.
('Natasha', 'Frances')
[Carrie] took her younger sister [Natasha] to the carnival last weekend. [Frances] offered to take her grandson [Richard] to the park but [Richard] wanted to stay home and play cards with his sister [Carrie] instead.
[{('Natasha', 'grandmother', 'Frances'): [('Natasha', 'sister', 'Carrie'), ('Carrie', 'grandmother', 'Frances')]}, {('Carrie', 'grandmother', 'Frances'): [('Carrie', 'brother', 'Richard'), ('Richard', 'grandmother', 'Frances')]}]
['sister', 'brother', 'grandmother']