[Charles] and his aunt, [Lynn], went to the museum, and spent the whole day there. [David] went to a movie with her sister [Lena]. [Lena] brought along her son [Charles] who loved going to the movies with his family.
('David', 'Lynn')
[David] went to a movie with her sister [Lena]. [Lena] brought along her son [Charles] who loved going to the movies with his family. [Charles] and his aunt, [Lynn], went to the museum, and spent the whole day there.
[{('David', 'sister', 'Lynn'): [('David', 'sister', 'Lena'), ('Lena', 'sister', 'Lynn')]}, {('Lena', 'sister', 'Lynn'): [('Lena', 'son', 'Charles'), ('Charles', 'aunt', 'Lynn')]}]
['sister', 'son', 'aunt']