[Nancy] paid for her sister [Lillian] and her father [Clarence] to go on a cruise to the Bahamas last spring.
('Clarence', 'Lillian')
[Nancy] paid for her sister [Lillian] and her father [Clarence] to go on a cruise to the Bahamas last spring.
[{('Clarence', 'daughter', 'Lillian'): [('Clarence', 'daughter', 'Nancy'), ('Nancy', 'sister', 'Lillian')]}]
['daughter', 'sister']