[Amy]'s son, [Milton], was busy with school activities and forgot to meet his sister. [George] is going to the arcade with his sister, [Amy].
('George', 'Milton')
[George] is going to the arcade with his sister, [Amy]. [Amy]'s son, [Milton], was busy with school activities and forgot to meet his sister.
[{('George', 'nephew', 'Milton'): [('George', 'sister', 'Amy'), ('Amy', 'son', 'Milton')]}]
['sister', 'son']