[Marie]'s husband, [Robert], could n't wait to take his daughter, [Elsie], riding for the first time. [John] called his brother, [Allan], to confirm when [Allan]'s sister, [Elsie], was coming to the dinner.
('Marie', 'John')
[Marie]'s husband, [Robert], could n't wait to take his daughter, [Elsie], riding for the first time. [John] called his brother, [Allan], to confirm when [Allan]'s sister, [Elsie], was coming to the dinner.
[{('Marie', 'son', 'John'): [('Marie', 'husband', 'Robert'), ('Robert', 'son', 'John')]}, {('Robert', 'son', 'John'): [('Robert', 'daughter', 'Elsie'), ('Elsie', 'brother', 'John')]}, {('Elsie', 'brother', 'John'): [('Elsie', 'brother', 'Allan'), ('Allan', 'brother', 'John')]}]
['husband', 'daughter', 'brother', 'brother']