[Hugh] took his wife [David] to see their daughter [Marie] perform in the school play. [Hugh] also invited his mother [Frances] to come view the show.
('Frances', 'Marie')
[Hugh] took his wife [David] to see their daughter [Marie] perform in the school play. [Hugh] also invited his mother [Frances] to come view the show.
[{('Frances', 'granddaughter', 'Marie'): [('Frances', 'son', 'Hugh'), ('Hugh', 'daughter', 'Marie')]}, {('Hugh', 'daughter', 'Marie'): [('Hugh', 'wife', 'David'), ('David', 'daughter', 'Marie')]}]
['son', 'wife', 'daughter']