[Fernando] warned his wife, [Gladys], that his father, [Ernest], would unexpectedly be joining them for dinner.
('Gladys', 'Ernest')
[Fernando] warned his wife, [Gladys], that his father, [Ernest], would unexpectedly be joining them for dinner.
[{('Gladys', 'father-in-law', 'Ernest'): [('Gladys', 'husband', 'Fernando'), ('Fernando', 'father', 'Ernest')]}]