[Pedro]'s wife, [Dorothy], just had a son. She decided to name him [Roberto]. [Roberto]'s mom, [Dorothy], took him and her daughter, [Rebecca], out for lunch,
('Pedro', 'Rebecca')
[Pedro]'s wife, [Dorothy], just had a son. She decided to name him [Roberto]. [Roberto]'s mom, [Dorothy], took him and her daughter, [Rebecca], out for lunch,
[{('Pedro', 'daughter', 'Rebecca'): [('Pedro', 'son', 'Roberto'), ('Roberto', 'sister', 'Rebecca')]}, {('Roberto', 'sister', 'Rebecca'): [('Roberto', 'mother', 'Dorothy'), ('Dorothy', 'daughter', 'Rebecca')]}, {('Pedro', 'son', 'Roberto'): [('Pedro', 'wife', 'Dorothy'), ('Dorothy', 'son', 'Roberto')]}]
['wife', 'son', 'mother', 'daughter']