[Jeff] asked his aunt [Lillian] what college he should attend. [Nancy] took her son [Jeff] to the mall to shop for school clothes.
('Nancy', 'Lillian')
[Nancy] took her son [Jeff] to the mall to shop for school clothes. [Jeff] asked his aunt [Lillian] what college he should attend.
[{('Nancy', 'sister', 'Lillian'): [('Nancy', 'son', 'Jeff'), ('Jeff', 'aunt', 'Lillian')]}]
['son', 'aunt']