[George]'s son, [John], was ill and needed to be picked up at school. [George] hurried to his side. [Theresa] had dinner with her sister. Her sister's son [John] was also there.
('George', 'Theresa')
[George]'s son, [John], was ill and needed to be picked up at school. [George] hurried to his side. [Theresa] had dinner with her sister. Her sister's son [John] was also there.
[{('George', 'sister', 'Theresa'): [('George', 'son', 'John'), ('John', 'aunt', 'Theresa')]}]
['son', 'aunt']