[James] and his uncle [Antonio] are two of the best poker players in town. [Jeffrey] took his mother, [Dorothy], and his father, [Pedro], out for their anniversary. [Dorothy]'s son, [James], wanted to join them, but had an urgent appointment and could n't make it.
('Pedro', 'Antonio')
[Jeffrey] took his mother, [Dorothy], and his father, [Pedro], out for their anniversary. [Dorothy]'s son, [James], wanted to join them, but had an urgent appointment and could n't make it. [James] and his uncle [Antonio] are two of the best poker players in town.
[{('Pedro', 'brother', 'Antonio'): [('Pedro', 'son', 'James'), ('James', 'uncle', 'Antonio')]}, {('Pedro', 'son', 'James'): [('Pedro', 'son', 'Jeffrey'), ('Jeffrey', 'brother', 'James')]}, {('Jeffrey', 'brother', 'James'): [('Jeffrey', 'mother', 'Dorothy'), ('Dorothy', 'son', 'James')]}]
['son', 'mother', 'son', 'uncle']