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