[James] and his wife [Frances] are going to be at the play. [James]'s daughter, [Lynn], was busy caring for her son, [Thomas], and could n't take his call.
('Frances', 'Thomas')
[James] and his wife [Frances] are going to be at the play. [James]'s daughter, [Lynn], was busy caring for her son, [Thomas], and could n't take his call.
[{('Frances', 'grandson', 'Thomas'): [('Frances', 'daughter', 'Lynn'), ('Lynn', 'son', 'Thomas')]}, {('Frances', 'daughter', 'Lynn'): [('Frances', 'husband', 'James'), ('James', 'daughter', 'Lynn')]}]
['husband', 'daughter', 'son']