[John] and his mother [Lillian] went to the animal shelter to adopt a cat. [Clarence] drove his daughter [Lillian] to school yesterday because she missed the bus.
('John', 'Clarence')
[John] and his mother [Lillian] went to the animal shelter to adopt a cat. [Clarence] drove his daughter [Lillian] to school yesterday because she missed the bus.
[{('John', 'grandfather', 'Clarence'): [('John', 'mother', 'Lillian'), ('Lillian', 'father', 'Clarence')]}]
['mother', 'father']