[Robert]'s mother [Nancy] wanted to surprise him for his birthday, so she baked him a cake. [Robert] was excited to surprise his wife [Lorraine] with tickets to her favorite musician's concert.
('Lorraine', 'Nancy')
[Robert] was excited to surprise his wife [Lorraine] with tickets to her favorite musician's concert. [Robert]'s mother [Nancy] wanted to surprise him for his birthday, so she baked him a cake.
[{('Lorraine', 'mother-in-law', 'Nancy'): [('Lorraine', 'husband', 'Robert'), ('Robert', 'mother', 'Nancy')]}]
['husband', 'mother']