[Frances] is [Irvin]'s grandmother. happy forevre [David] went to a movie with her sister [Lena]. [Lena] brought along her son [Irvin] who loved going to the movies with his family.
('David', 'Frances')
[David] went to a movie with her sister [Lena]. [Lena] brought along her son [Irvin] who loved going to the movies with his family. [Frances] is [Irvin]'s grandmother. happy forevre
[{('David', 'mother', 'Frances'): [('David', 'sister', 'Lena'), ('Lena', 'mother', 'Frances')]}, {('Lena', 'mother', 'Frances'): [('Lena', 'son', 'Irvin'), ('Irvin', 'grandmother', 'Frances')]}]
['sister', 'son', 'grandmother']