[Heidi] and her mother [Nancy] attended a play at the theater. [Lorraine] took her mother, [Nancy], out for lunch.
('Lorraine', 'Heidi')
[Lorraine] took her mother, [Nancy], out for lunch. [Heidi] and her mother [Nancy] attended a play at the theater.
[{('Lorraine', 'sister', 'Heidi'): [('Lorraine', 'mother', 'Nancy'), ('Nancy', 'daughter', 'Heidi')]}]
['mother', 'daughter']