[Charles] was visiting his grandparents' house and saw [Frances] first. [Lynn] went to a movie with her sister [Lena]. [Lena] brought along her son [Charles] who loved going to the movies with his family.
('Lynn', 'Frances')
[Lynn] went to a movie with her sister [Lena]. [Lena] brought along her son [Charles] who loved going to the movies with his family. [Charles] was visiting his grandparents' house and saw [Frances] first.
[{('Lynn', 'mother', 'Frances'): [('Lynn', 'sister', 'Lena'), ('Lena', 'mother', 'Frances')]}, {('Lena', 'mother', 'Frances'): [('Lena', 'son', 'Charles'), ('Charles', 'grandmother', 'Frances')]}]
['sister', 'son', 'grandmother']