[Joshua] watched his son [Clarence] play catch. [Clarence] tossed the ball back and fourth with his brother [Joseph]. [Joseph] could n't wait to introduce his new son to his uncle, [Hugh].
('Joshua', 'Hugh')
[Joshua] watched his son [Clarence] play catch. [Clarence] tossed the ball back and fourth with his brother [Joseph]. [Joseph] could n't wait to introduce his new son to his uncle, [Hugh].
[{('Joshua', 'brother', 'Hugh'): [('Joshua', 'son', 'Joseph'), ('Joseph', 'uncle', 'Hugh')]}, {('Joshua', 'son', 'Joseph'): [('Joshua', 'son', 'Clarence'), ('Clarence', 'brother', 'Joseph')]}]
['son', 'brother', 'uncle']