[James] is a benevolent grandfather, and [Richard] is his young grandson. [Richard] took a cab to the mall with his sister [Carrie]. [Carrie]'s sister [Natasha] drove herself there.
('Natasha', 'James')
[Richard] took a cab to the mall with his sister [Carrie]. [Carrie]'s sister [Natasha] drove herself there. [James] is a benevolent grandfather, and [Richard] is his young grandson.
[{('Natasha', 'grandfather', 'James'): [('Natasha', 'sister', 'Carrie'), ('Carrie', 'grandfather', 'James')]}, {('Carrie', 'grandfather', 'James'): [('Carrie', 'brother', 'Richard'), ('Richard', 'grandfather', 'James')]}]
['sister', 'brother', 'grandfather']