[Amy]'s sister [Nancy] helped her pick out a Father's Day gift for her father, [Clarence].
('Nancy', 'Clarence')
[Amy]'s sister [Nancy] helped her pick out a Father's Day gift for her father, [Clarence].
[{('Nancy', 'father', 'Clarence'): [('Nancy', 'sister', 'Amy'), ('Amy', 'father', 'Clarence')]}]
['sister', 'father']