[Pamela] made her grandfather, [James], proud by winning an essay competition. [Pamela]'s sister, [Martha], bought her flowers as a reward. [Tina] and her sister [Martha] are the only children in their family.
('James', 'Tina')
[Pamela] made her grandfather, [James], proud by winning an essay competition. [Pamela]'s sister, [Martha], bought her flowers as a reward. [Tina] and her sister [Martha] are the only children in their family.
[{('James', 'granddaughter', 'Tina'): [('James', 'granddaughter', 'Martha'), ('Martha', 'sister', 'Tina')]}, {('James', 'granddaughter', 'Martha'): [('James', 'granddaughter', 'Pamela'), ('Pamela', 'sister', 'Martha')]}]
['granddaughter', 'sister', 'sister']