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