[James] is a sibling of [Tony]. [Theresa]'s son [Tony] missed seeing his mother on the weekends.
('James', 'Theresa')
[James] is a sibling of [Tony]. [Theresa]'s son [Tony] missed seeing his mother on the weekends.
[{('James', 'mother', 'Theresa'): [('James', 'brother', 'Tony'), ('Tony', 'mother', 'Theresa')]}]
['brother', 'mother']