[James] took his wife [Frances] to the new restaurant for dinner last Saturday. [David] and her son [Michael] went to visit her mother [Frances] on Sunday afternoon. They ate dinner and talked.
('James', 'Michael')
[James] took his wife [Frances] to the new restaurant for dinner last Saturday. [David] and her son [Michael] went to visit her mother [Frances] on Sunday afternoon. They ate dinner and talked.
[{('James', 'grandson', 'Michael'): [('James', 'wife', 'Frances'), ('Frances', 'grandson', 'Michael')]}, {('Frances', 'grandson', 'Michael'): [('Frances', 'daughter', 'David'), ('David', 'son', 'Michael')]}]
['wife', 'daughter', 'son']