[Robert] took his daughter [Elsie] and his son [Allan] to school. [Allan]'s brother [John] stayed at home too sick to go. [Michelle]'s sister, [Elsie], recently started acting.
('John', 'Michelle')
[Robert] took his daughter [Elsie] and his son [Allan] to school. [Allan]'s brother [John] stayed at home too sick to go. [Michelle]'s sister, [Elsie], recently started acting.
[{('John', 'sister', 'Michelle'): [('John', 'brother', 'Allan'), ('Allan', 'sister', 'Michelle')]}, {('Allan', 'sister', 'Michelle'): [('Allan', 'sister', 'Elsie'), ('Elsie', 'sister', 'Michelle')]}, {('Allan', 'sister', 'Elsie'): [('Allan', 'father', 'Robert'), ('Robert', 'daughter', 'Elsie')]}]
['brother', 'father', 'daughter', 'sister']