[James] and [Frances]'s daughter, [Lynn], had to leave dinner early because her son, [Don] was sick.
('Frances', 'Don')
[James] and [Frances]'s daughter, [Lynn], had to leave dinner early because her son, [Don] was sick.
[{('Frances', 'grandson', 'Don'): [('Frances', 'husband', 'James'), ('James', 'grandson', 'Don')]}, {('James', 'grandson', 'Don'): [('James', 'daughter', 'Lynn'), ('Lynn', 'son', 'Don')]}]
['husband', 'daughter', 'son']