story: [Alma] invited her mother [Gabrielle] to spend a couple of day with her and her son [Robert].
query: ('Robert', 'Gabrielle')
clean_story: [Alma] invited her mother [Gabrielle] to spend a couple of day with her and her son [Robert].
proof_state: [{('Robert', 'grandmother', 'Gabrielle'): [('Robert', 'mother', 'Alma'), ('Alma', 'mother', 'Gabrielle')]}]