[Hugh] decided to take his daughter [Marie] to Disneyworld. [Marie] took her mother, [David], out for lunch. [David] took her mother, [Frances], out for lunch.
('Hugh', 'Frances')
[Hugh] decided to take his daughter [Marie] to Disneyworld. [Marie] took her mother, [David], out for lunch. [David] took her mother, [Frances], out for lunch.
[{('Hugh', 'mother', 'Frances'): [('Hugh', 'daughter', 'Marie'), ('Marie', 'grandmother', 'Frances')]}, {('Marie', 'grandmother', 'Frances'): [('Marie', 'mother', 'David'), ('David', 'mother', 'Frances')]}]
['daughter', 'mother', 'mother']