[Tracy] was talking about food with her sister [Dorothy]. [Tracy] was sewing a sweater for her sister [Dorothy]. [Beverly] took her sister [Dorothy] and brother [Robert] with her to shop for her wedding dress.
('Dorothy', 'Robert')
[Tracy] was sewing a sweater for her sister [Dorothy]. [Tracy] was talking about food with her sister [Dorothy]. [Beverly] took her sister [Dorothy] and brother [Robert] with her to shop for her wedding dress.
[{('Dorothy', 'brother', 'Robert'): [('Dorothy', 'sister', 'Tracy'), ('Tracy', 'brother', 'Robert')]}, {('Tracy', 'brother', 'Robert'): [('Tracy', 'sister', 'Beverly'), ('Beverly', 'brother', 'Robert')]}, {('Tracy', 'sister', 'Beverly'): [('Tracy', 'sister', 'Dorothy'), ('Dorothy', 'sister', 'Beverly')]}]
['sister', 'sister', 'sister', 'brother']