[Anna] went to the lake for a picnic with her sisters [Wilhelmina] and [Natasha]. [Natasha] invited her grandfather [James] to join them, but he could n't join them.
('James', 'Wilhelmina')
[Anna] went to the lake for a picnic with her sisters [Wilhelmina] and [Natasha]. [Natasha] invited her grandfather [James] to join them, but he could n't join them.
[{('James', 'granddaughter', 'Wilhelmina'): [('James', 'granddaughter', 'Natasha'), ('Natasha', 'sister', 'Wilhelmina')]}, {('Natasha', 'sister', 'Wilhelmina'): [('Natasha', 'sister', 'Anna'), ('Anna', 'sister', 'Wilhelmina')]}]
['granddaughter', 'sister', 'sister']