[Nancy] and her daughter [Heidi] were on vaction. [Ashley] picked up her daughter [Nancy] from school early.
('Heidi', 'Ashley')
[Nancy] and her daughter [Heidi] were on vaction. [Ashley] picked up her daughter [Nancy] from school early.
[{('Heidi', 'grandmother', 'Ashley'): [('Heidi', 'mother', 'Nancy'), ('Nancy', 'mother', 'Ashley')]}]
['mother', 'mother']