[Roy] and his daughter, [Martha] go to concerts every week. [Martha] was playing hide-and-seek with her sister [Lois].
('Roy', 'Lois')
[Roy] and his daughter, [Martha] go to concerts every week. [Martha] was playing hide-and-seek with her sister [Lois].
[{('Roy', 'daughter', 'Lois'): [('Roy', 'daughter', 'Martha'), ('Martha', 'sister', 'Lois')]}]