[Frances] took her husband [James] and grandson [Chris] shopping for a gift for [Chris]'s brother, [Charles].
('James', 'Charles')
[Frances] took her husband [James] and grandson [Chris] shopping for a gift for [Chris]'s brother, [Charles].
[{('James', 'grandson', 'Charles'): [('James', 'grandson', 'Chris'), ('Chris', 'brother', 'Charles')]}, {('James', 'grandson', 'Chris'): [('James', 'wife', 'Frances'), ('Frances', 'grandson', 'Chris')]}]
['wife', 'grandson', 'brother']