[Hugh] and [David], a married couple, took [David]'s mother [Frances] out to lunch for her birthday. [Bobby] is a man with a son named [Hugh].
('Frances', 'Bobby')
[Hugh] and [David], a married couple, took [David]'s mother [Frances] out to lunch for her birthday. [Bobby] is a man with a son named [Hugh].
[{('Frances', 'grandson', 'Bobby'): [('Frances', 'daughter', 'David'), ('David', 'son', 'Bobby')]}, {('David', 'son', 'Bobby'): [('David', 'husband', 'Hugh'), ('Hugh', 'son', 'Bobby')]}]
['daughter', 'husband', 'son']