[Lillian] and her father, [Clarence], were dancing. [John] cut in and asked his mother if he could dance with her next.
('John', 'Clarence')
[Lillian] and her father, [Clarence], were dancing. [John] cut in and asked his mother if he could dance with her next.
[{('John', 'grandfather', 'Clarence'): [('John', 'mother', 'Lillian'), ('Lillian', 'father', 'Clarence')]}]
['mother', 'father']