story: [Jeffrey]'s mother [Myrna] made a cake for his birthday and her other son [William] ate a piece of it.
query: ('Jeffrey', 'William')
clean_story: [Jeffrey]'s mother [Myrna] made a cake for his birthday and her other son [William] ate a piece of it.
proof_state: [{('Jeffrey', 'brother', 'William'): [('Jeffrey', 'mother', 'Myrna'), ('Myrna', 'son', 'William')]}]