[Constance] and her sister [Martha] went shopping at the mall. [Constance]'s daughter [Gladys] stayed home to study.
('Martha', 'Gladys')
[Constance] and her sister [Martha] went shopping at the mall. [Constance]'s daughter [Gladys] stayed home to study.
[{('Martha', 'niece', 'Gladys'): [('Martha', 'sister', 'Constance'), ('Constance', 'daughter', 'Gladys')]}]