[Theresa]'s son [Nicolas] went on a hiking trip with her husband [Dale].
('Dale', 'Nicolas')
[Theresa]'s son [Nicolas] went on a hiking trip with her husband [Dale].
[{('Dale', 'son', 'Nicolas'): [('Dale', 'wife', 'Theresa'), ('Theresa', 'son', 'Nicolas')]}]
['wife', 'son']