[Nancy] took her daughter, [Lorraine], to lunch. [Nancy] took her son, [Kevin], to the movie theater for his birthday.
('Lorraine', 'Kevin')
[Nancy] took her daughter, [Lorraine], to lunch. [Nancy] took her son, [Kevin], to the movie theater for his birthday.
[{('Lorraine', 'brother', 'Kevin'): [('Lorraine', 'mother', 'Nancy'), ('Nancy', 'son', 'Kevin')]}]
['mother', 'son']