[Lena] gave her son [Chris] and daughter [Pamela] money to spend. [Chris]'s sister [Tina] was annoyed.
('Pamela', 'Tina')
[Lena] gave her son [Chris] and daughter [Pamela] money to spend. [Chris]'s sister [Tina] was annoyed.
[{('Pamela', 'sister', 'Tina'): [('Pamela', 'brother', 'Chris'), ('Chris', 'sister', 'Tina')]}, {('Pamela', 'brother', 'Chris'): [('Pamela', 'mother', 'Lena'), ('Lena', 'son', 'Chris')]}]
['mother', 'son', 'sister']