[Lena], her sister [David], and her son [Theodore], went to visit [Frances]. [Theodore] always comes with them to visit [Frances], because he loves his grandmother very much.
('David', 'Frances')
[Lena], her sister [David], and her son [Theodore], went to visit [Frances]. [Theodore] always comes with them to visit [Frances], because he loves his grandmother very much.
[{('David', 'mother', 'Frances'): [('David', 'sister', 'Lena'), ('Lena', 'mother', 'Frances')]}, {('Lena', 'mother', 'Frances'): [('Lena', 'son', 'Theodore'), ('Theodore', 'grandmother', 'Frances')]}]
['sister', 'son', 'grandmother']