[Lillian] and [Nancy] are sisters who have one brother named [Nicholas].
('Nancy', 'Lillian')
[Lillian] and [Nancy] are sisters who have one brother named [Nicholas].
[{('Nancy', 'sister', 'Lillian'): [('Nancy', 'brother', 'Nicholas'), ('Nicholas', 'sister', 'Lillian')]}]
['brother', 'sister']