[Francisco] was teaching his son [Pete] and his sister [Wilhelmina] how to swim. [Wilhelmina]'s sister [Anna] already knew how to swim, so she was n't there.
('Francisco', 'Anna')
[Francisco] was teaching his son [Pete] and his sister [Wilhelmina] how to swim. [Wilhelmina]'s sister [Anna] already knew how to swim, so she was n't there.
[{('Francisco', 'daughter', 'Anna'): [('Francisco', 'daughter', 'Wilhelmina'), ('Wilhelmina', 'sister', 'Anna')]}, {('Francisco', 'daughter', 'Wilhelmina'): [('Francisco', 'son', 'Pete'), ('Pete', 'sister', 'Wilhelmina')]}]
['son', 'sister', 'sister']