[Dennis] and his aunt, [Nancy], went to the museum, and spent the whole day there. [Amy] took her son [Dennis] to the mall to shop for school clothes.
('Amy', 'Nancy')
[Amy] took her son [Dennis] to the mall to shop for school clothes. [Dennis] and his aunt, [Nancy], went to the museum, and spent the whole day there.
[{('Amy', 'sister', 'Nancy'): [('Amy', 'son', 'Dennis'), ('Dennis', 'aunt', 'Nancy')]}]
['son', 'aunt']