[David]'s daughter [Frances] and son [Johnson] went to the night market with [Johnson]'s brother [Michael].
('Frances', 'Michael')
[David]'s daughter [Frances] and son [Johnson] went to the night market with [Johnson]'s brother [Michael].
[{('Frances', 'grandson', 'Michael'): [('Frances', 'daughter', 'David'), ('David', 'son', 'Michael')]}, {('David', 'son', 'Michael'): [('David', 'son', 'Johnson'), ('Johnson', 'brother', 'Michael')]}]
['daughter', 'son', 'brother']