story: [Robert] needed his brother, [Jess], to help with a problem [Leo] tripped his brother [Robert] in the living room. [Nancy] is so happy for her son. Her son [Robert] just joined the Army.
query: ('Leo', 'Nancy')
clean_story: [Leo] tripped his brother [Robert] in the living room. [Nancy] is so happy for her son. Her son [Robert] just joined the Army.
proof_state: [{('Leo', 'mother', 'Nancy'): [('Leo', 'brother', 'Robert'), ('Robert', 'mother', 'Nancy')]}]