[Lynn] takes her son [Clarence] to the park every Saturday. [Joshua]'s son, [Clarence], loves trains. [Joshua]'s sister, [David], got him a nice model trail set for his birthday.
('Lynn', 'David')
[Lynn] takes her son [Clarence] to the park every Saturday. [Joshua]'s son, [Clarence], loves trains. [Joshua]'s sister, [David], got him a nice model trail set for his birthday.
[{('Lynn', 'sister', 'David'): [('Lynn', 'son', 'Clarence'), ('Clarence', 'aunt', 'David')]}, {('Clarence', 'aunt', 'David'): [('Clarence', 'father', 'Joshua'), ('Joshua', 'sister', 'David')]}]
['son', 'father', 'sister']