[Marie] was sewing a sweater for her sister [Dorothy]. [Cheryl] is a sister of [Jeffrey]. [Dorothy] and her daughter [Cheryl] went shopping together last Monday and they bought new shoes for [Dorothy]'s kids. [Tracy] took her sister [Marie] out for dinner to celebrate her birthday.
('Jeffrey', 'Tracy')
[Cheryl] is a sister of [Jeffrey]. [Dorothy] and her daughter [Cheryl] went shopping together last Monday and they bought new shoes for [Dorothy]'s kids. [Marie] was sewing a sweater for her sister [Dorothy]. [Tracy] took her sister [Marie] out for dinner to celebrate her birthday.
[{('Jeffrey', 'aunt', 'Tracy'): [('Jeffrey', 'mother', 'Dorothy'), ('Dorothy', 'sister', 'Tracy')]}, {('Jeffrey', 'mother', 'Dorothy'): [('Jeffrey', 'sister', 'Cheryl'), ('Cheryl', 'mother', 'Dorothy')]}, {('Dorothy', 'sister', 'Tracy'): [('Dorothy', 'sister', 'Marie'), ('Marie', 'sister', 'Tracy')]}]
['sister', 'mother', 'sister', 'sister']