[Robert] bought a book for his son [Allan]. [Elsie]'s sister, [Michelle], recently started acting. [John] and his brother [Allan] went to the boxing match. [Elsie] was upset her brother [John] did n't invite her.
('Michelle', 'Robert')
[Elsie]'s sister, [Michelle], recently started acting. [John] and his brother [Allan] went to the boxing match. [Elsie] was upset her brother [John] did n't invite her. [Robert] bought a book for his son [Allan].
[{('Michelle', 'father', 'Robert'): [('Michelle', 'brother', 'John'), ('John', 'father', 'Robert')]}, {('John', 'father', 'Robert'): [('John', 'brother', 'Allan'), ('Allan', 'father', 'Robert')]}, {('Michelle', 'brother', 'John'): [('Michelle', 'sister', 'Elsie'), ('Elsie', 'brother', 'John')]}]
['sister', 'brother', 'brother', 'father']