story: [Karen] and her mother [Melissa] went to volunteer at the homeless shelter last weekend. [Brian] likes it when his mother, [Melissa], plays the flute. [Melissa] learned this skill from her mother, [Michelle].
query: ('Brian', 'Michelle')
clean_story: [Brian] likes it when his mother, [Melissa], plays the flute. [Melissa] learned this skill from her mother, [Michelle].
proof_state: [{('Brian', 'grandmother', 'Michelle'): [('Brian', 'mother', 'Melissa'), ('Melissa', 'mother', 'Michelle')]}]