[Chris] asked his mother, [Lena], to bake him a cake. She told him to wait for his birthday. [Lena] and her daughter [Martha] went out to dinner. [Martha] ca n't wait to see her favorite aunt [David].
('Chris', 'David')
[Chris] asked his mother, [Lena], to bake him a cake. She told him to wait for his birthday. [Lena] and her daughter [Martha] went out to dinner. [Martha] ca n't wait to see her favorite aunt [David].
[{('Chris', 'aunt', 'David'): [('Chris', 'mother', 'Lena'), ('Lena', 'sister', 'David')]}, {('Lena', 'sister', 'David'): [('Lena', 'daughter', 'Martha'), ('Martha', 'aunt', 'David')]}]
['mother', 'daughter', 'aunt']