[Joshua]'s brother [Hugh] and sister [Cindy] went to Hawaii with [Cindy]'s daughter, [Wilhelmina].
('Hugh', 'Wilhelmina')
[Joshua]'s brother [Hugh] and sister [Cindy] went to Hawaii with [Cindy]'s daughter, [Wilhelmina].
[{('Hugh', 'niece', 'Wilhelmina'): [('Hugh', 'sister', 'Cindy'), ('Cindy', 'daughter', 'Wilhelmina')]}, {('Hugh', 'sister', 'Cindy'): [('Hugh', 'brother', 'Joshua'), ('Joshua', 'sister', 'Cindy')]}]
['brother', 'sister', 'daughter']