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