[Frances]'s son, [Joshua], came to visit for Christmas with his sister [David] and her daughter, [Marie].
('Frances', 'Marie')
[Frances]'s son, [Joshua], came to visit for Christmas with his sister [David] and her daughter, [Marie].
[{('Frances', 'granddaughter', 'Marie'): [('Frances', 'daughter', 'David'), ('David', 'daughter', 'Marie')]}, {('Frances', 'daughter', 'David'): [('Frances', 'son', 'Joshua'), ('Joshua', 'sister', 'David')]}]
['son', 'sister', 'daughter']