[Nicholas] took his son [Glen] to the dentist yesterday and while there they saw [Nicholas]'s sister [Theresa].
('Glen', 'Theresa')
[Nicholas] took his son [Glen] to the dentist yesterday and while there they saw [Nicholas]'s sister [Theresa].
[{('Glen', 'aunt', 'Theresa'): [('Glen', 'father', 'Nicholas'), ('Nicholas', 'sister', 'Theresa')]}]
['father', 'sister']