[Dorothy] and her husband [Pedro] bought a house near the beach and they really like it. [Pedro] took his daughter [Rebecca] to the zoo on Saturday. [Pedro]'s wife [Dorothy] could n't come as she had to work that day. [Rebecca] really enjoys visiting her grandfather [Harold].
('Pedro', 'Harold')
[Dorothy] and her husband [Pedro] bought a house near the beach and they really like it. [Pedro] took his daughter [Rebecca] to the zoo on Saturday. [Pedro]'s wife [Dorothy] could n't come as she had to work that day. [Rebecca] really enjoys visiting her grandfather [Harold].
[{('Pedro', 'father-in-law', 'Harold'): [('Pedro', 'wife', 'Dorothy'), ('Dorothy', 'father', 'Harold')]}, {('Dorothy', 'father', 'Harold'): [('Dorothy', 'daughter', 'Rebecca'), ('Rebecca', 'grandfather', 'Harold')]}, {('Dorothy', 'daughter', 'Rebecca'): [('Dorothy', 'husband', 'Pedro'), ('Pedro', 'daughter', 'Rebecca')]}]
['wife', 'husband', 'daughter', 'grandfather']