[Robert] took his son [Mario] for boxing lessons. He felt the boy needed to toughen up. [Dorothy]'s husband, [Pedro], and her son [Jerome] went fishing last weekend. [Mario]'s uncle [Pedro] loved hanging out with him.
('Robert', 'Jerome')
[Robert] took his son [Mario] for boxing lessons. He felt the boy needed to toughen up. [Mario]'s uncle [Pedro] loved hanging out with him. [Dorothy]'s husband, [Pedro], and her son [Jerome] went fishing last weekend.
[{('Robert', 'nephew', 'Jerome'): [('Robert', 'brother', 'Pedro'), ('Pedro', 'son', 'Jerome')]}, {('Robert', 'brother', 'Pedro'): [('Robert', 'son', 'Mario'), ('Mario', 'uncle', 'Pedro')]}, {('Pedro', 'son', 'Jerome'): [('Pedro', 'wife', 'Dorothy'), ('Dorothy', 'son', 'Jerome')]}]
['son', 'uncle', 'wife', 'son']