[David] took her son, [Bobby], to the movie theater for his birthday. [Frances] could n't wait to get off the plane to see her mother, [Lena]. [Bobby] ca n't stand his unfriendly aunt [Lena].
('David', 'Frances')
[David] took her son, [Bobby], to the movie theater for his birthday. [Bobby] ca n't stand his unfriendly aunt [Lena]. [Frances] could n't wait to get off the plane to see her mother, [Lena].
[{('David', 'mother', 'Frances'): [('David', 'sister', 'Lena'), ('Lena', 'mother', 'Frances')]}, {('David', 'sister', 'Lena'): [('David', 'son', 'Bobby'), ('Bobby', 'aunt', 'Lena')]}]
['son', 'aunt', 'mother']