[John] and his sister [Ann] took their father out to eat for his birthday. They had a great time. [Ann]'s grandmother [Ashley] baked cookies for her after she came home from school.
('John', 'Ashley')
[John] and his sister [Ann] took their father out to eat for his birthday. They had a great time. [Ann]'s grandmother [Ashley] baked cookies for her after she came home from school.
[{('John', 'grandmother', 'Ashley'): [('John', 'sister', 'Ann'), ('Ann', 'grandmother', 'Ashley')]}]
['sister', 'grandmother']