story: [Crystal] drove her son [David] to soccer practice. When she got back home she made some snacks for her daughter [Mary]. [Crystal] baked a cake for her son [Mark].
query: ('Mary', 'David')
clean_story: [Crystal] drove her son [David] to soccer practice. When she got back home she made some snacks for her daughter [Mary].
proof_state: [{('Mary', 'brother', 'David'): [('Mary', 'mother', 'Crystal'), ('Crystal', 'son', 'David')]}]