[Theresa] went to her brother [Nicholas]'s house and his daughter [Mary] was playing outside
('Theresa', 'Mary')
[Theresa] went to her brother [Nicholas]'s house and his daughter [Mary] was playing outside
[{('Theresa', 'niece', 'Mary'): [('Theresa', 'brother', 'Nicholas'), ('Nicholas', 'daughter', 'Mary')]}]
['brother', 'daughter']