[Lillian] made breakfast for her sister [Nancy]. [Nancy]'s brother [Dale] sat down at the table with a bowl of cereal.
('Dale', 'Lillian')
[Lillian] made breakfast for her sister [Nancy]. [Nancy]'s brother [Dale] sat down at the table with a bowl of cereal.
[{('Dale', 'sister', 'Lillian'): [('Dale', 'sister', 'Nancy'), ('Nancy', 'sister', 'Lillian')]}]
['sister', 'sister']