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