[David] and her mother [Frances] went dress shopping on Saturday. [Joshua] asks his son [Clarence] to get his grandmother [Frances] a glass of water
('Joshua', 'David')
[Joshua] asks his son [Clarence] to get his grandmother [Frances] a glass of water [David] and her mother [Frances] went dress shopping on Saturday.
[{('Joshua', 'sister', 'David'): [('Joshua', 'mother', 'Frances'), ('Frances', 'daughter', 'David')]}, {('Joshua', 'mother', 'Frances'): [('Joshua', 'son', 'Clarence'), ('Clarence', 'grandmother', 'Frances')]}]
['son', 'grandmother', 'daughter']