[Nancy] played golf with her son [Kevin]. [Kevin]'s sister [Lorraine] watched with delight.
('Lorraine', 'Nancy')
[Nancy] played golf with her son [Kevin]. [Kevin]'s sister [Lorraine] watched with delight.
[{('Lorraine', 'mother', 'Nancy'): [('Lorraine', 'brother', 'Kevin'), ('Kevin', 'mother', 'Nancy')]}]
['brother', 'mother']