[Nancy] and her father [Clarence] went to the park. They had a wonderful time there, feeding the ducks. [Linda] went shopping at the mall with her mother [Nancy]
('Linda', 'Clarence')
[Linda] went shopping at the mall with her mother [Nancy] [Nancy] and her father [Clarence] went to the park. They had a wonderful time there, feeding the ducks.
[{('Linda', 'grandfather', 'Clarence'): [('Linda', 'mother', 'Nancy'), ('Nancy', 'father', 'Clarence')]}]
['mother', 'father']