[Pedro] loves dancing with his wife. Her name is [Dorothy]. [Pedro] and his brother [Robert] took his son [Ronald] fishing. [Ronald] 'grandfather [Harold] was upset that he was n't able to go.
('Dorothy', 'Harold')
[Pedro] loves dancing with his wife. Her name is [Dorothy]. [Pedro] and his brother [Robert] took his son [Ronald] fishing. [Ronald] 'grandfather [Harold] was upset that he was n't able to go.
[{('Dorothy', 'father-in-law', 'Harold'): [('Dorothy', 'husband', 'Pedro'), ('Pedro', 'father', 'Harold')]}, {('Pedro', 'father', 'Harold'): [('Pedro', 'brother', 'Robert'), ('Robert', 'father', 'Harold')]}, {('Robert', 'father', 'Harold'): [('Robert', 'son', 'Ronald'), ('Ronald', 'grandfather', 'Harold')]}]
['husband', 'brother', 'son', 'grandfather']