[Hugh] drove to his sister [Cindy]'s house, where he saw [Cindy]'s son [Pete] and his sister [Anna].
('Hugh', 'Anna')
[Hugh] drove to his sister [Cindy]'s house, where he saw [Cindy]'s son [Pete] and his sister [Anna].
[{('Hugh', 'niece', 'Anna'): [('Hugh', 'sister', 'Cindy'), ('Cindy', 'daughter', 'Anna')]}, {('Cindy', 'daughter', 'Anna'): [('Cindy', 'son', 'Pete'), ('Pete', 'sister', 'Anna')]}]
['sister', 'son', 'sister']