[Nicholas]'s sister, [Nancy], was so happy to have him home. He was home from college. [Nicholas] and his son [Michael] went to the skating rink.
('Michael', 'Nancy')
[Nicholas] and his son [Michael] went to the skating rink. [Nicholas]'s sister, [Nancy], was so happy to have him home. He was home from college.
[{('Michael', 'aunt', 'Nancy'): [('Michael', 'father', 'Nicholas'), ('Nicholas', 'sister', 'Nancy')]}]
['father', 'sister']