[Nancy] has a sister named [Lillian] and a brother named [Dale].
('Nancy', 'Lillian')
[Nancy] has a sister named [Lillian] and a brother named [Dale].
[{('Nancy', 'sister', 'Lillian'): [('Nancy', 'brother', 'Dale'), ('Dale', 'sister', 'Lillian')]}]
['brother', 'sister']