[Cindy]'s brother [Wesley] and sister [David] went on a cruise with [David]'s son, [Bobby].
('Wesley', 'Bobby')
[Cindy]'s brother [Wesley] and sister [David] went on a cruise with [David]'s son, [Bobby].
[{('Wesley', 'nephew', 'Bobby'): [('Wesley', 'sister', 'David'), ('David', 'son', 'Bobby')]}, {('Wesley', 'sister', 'David'): [('Wesley', 'sister', 'Cindy'), ('Cindy', 'sister', 'David')]}]
['sister', 'sister', 'son']