[Pedro] took his wife, [Dorothy], out to see a play. [Dorothy]'s daughter, [Cheryl], stayed home to do homework. [Robert]'s son, [Allan], had been misbehaving, so [Robert] had to spank him. [Allan] went fishing with his uncle [Pedro].
('Robert', 'Cheryl')
[Robert]'s son, [Allan], had been misbehaving, so [Robert] had to spank him. [Allan] went fishing with his uncle [Pedro]. [Pedro] took his wife, [Dorothy], out to see a play. [Dorothy]'s daughter, [Cheryl], stayed home to do homework.
[{('Robert', 'niece', 'Cheryl'): [('Robert', 'brother', 'Pedro'), ('Pedro', 'daughter', 'Cheryl')]}, {('Pedro', 'daughter', 'Cheryl'): [('Pedro', 'wife', 'Dorothy'), ('Dorothy', 'daughter', 'Cheryl')]}, {('Robert', 'brother', 'Pedro'): [('Robert', 'son', 'Allan'), ('Allan', 'uncle', 'Pedro')]}]
['son', 'uncle', 'wife', 'daughter']