story: [Mark]'s mother [Marian] wanted to surprise him for his birthday, so she baked him a cake. [Alan] is one of [Marian]'s brothers. They have lots of fun together. [Alan] went to the park with his father, [Stanley].
query: ('Mark', 'Stanley')
clean_story: [Mark]'s mother [Marian] wanted to surprise him for his birthday, so she baked him a cake. [Alan] is one of [Marian]'s brothers. They have lots of fun together. [Alan] went to the park with his father, [Stanley].
proof_state: [{('Mark', 'grandfather', 'Stanley'): [('Mark', 'mother', 'Marian'), ('Marian', 'father', 'Stanley')]}, {('Marian', 'father', 'Stanley'): [('Marian', 'brother', 'Alan'), ('Alan', 'father', 'Stanley')]}]