[Theresa] was happy that her son [Travis] was getting along with his wife [Belva].
('Theresa', 'Belva')
[Theresa] was happy that her son [Travis] was getting along with his wife [Belva].
[{('Theresa', 'daughter-in-law', 'Belva'): [('Theresa', 'son', 'Travis'), ('Travis', 'wife', 'Belva')]}]
['son', 'wife']