[Frances]'s granddaughter [Anna] and her brother [Pete] are visiting [Frances] and her husband [James].
('James', 'Pete')
[Frances]'s granddaughter [Anna] and her brother [Pete] are visiting [Frances] and her husband [James].
[{('James', 'grandson', 'Pete'): [('James', 'granddaughter', 'Anna'), ('Anna', 'brother', 'Pete')]}, {('James', 'granddaughter', 'Anna'): [('James', 'wife', 'Frances'), ('Frances', 'granddaughter', 'Anna')]}]
['wife', 'granddaughter', 'brother']