[Roy] bought his daughter, [Martha], flowers. [Martha] took her daughter, [Ann], out to High Tea yesterday afternoon.
('Roy', 'Ann')
[Roy] bought his daughter, [Martha], flowers. [Martha] took her daughter, [Ann], out to High Tea yesterday afternoon.
[{('Roy', 'granddaughter', 'Ann'): [('Roy', 'daughter', 'Martha'), ('Martha', 'daughter', 'Ann')]}]