[Lillian] is so proud that [Clarence], his father, quit smoking. [Lillian] was so glad to travel with her son, [John]. He made the trip enjoyable.
('John', 'Clarence')
[Lillian] was so glad to travel with her son, [John]. He made the trip enjoyable. [Lillian] is so proud that [Clarence], his father, quit smoking.
[{('John', 'grandfather', 'Clarence'): [('John', 'mother', 'Lillian'), ('Lillian', 'father', 'Clarence')]}]
['mother', 'father']