[Lena] invited her father [James] to dinner. [Lena] wanted her daughter, [Martha], to go shopping with her. [Martha] invited her sister, [Pamela].
('James', 'Pamela')
[Lena] invited her father [James] to dinner. [Lena] wanted her daughter, [Martha], to go shopping with her. [Martha] invited her sister, [Pamela].
[{('James', 'granddaughter', 'Pamela'): [('James', 'daughter', 'Lena'), ('Lena', 'daughter', 'Pamela')]}, {('Lena', 'daughter', 'Pamela'): [('Lena', 'daughter', 'Martha'), ('Martha', 'sister', 'Pamela')]}]
['daughter', 'daughter', 'sister']