[Jeff] treated his father [Wayne] and sister [Lorraine] to a fancy dinner.
('Lorraine', 'Wayne')
[Jeff] treated his father [Wayne] and sister [Lorraine] to a fancy dinner.
[{('Lorraine', 'father', 'Wayne'): [('Lorraine', 'brother', 'Jeff'), ('Jeff', 'father', 'Wayne')]}]
['brother', 'father']