I support your efforts completely as I am a totally anal cat parent We are at around week seven in our trying to indoctrinate our new boy, Murphy, 6, with our existing g kitties, Conor. 7, and Lorna. We have the diffusers, a pet gate, calming sprays and Rescue Remedy. which I need to try this go round. Does that work for you? I sincerely hope you can solve this so your boys are once again comfortable in their home.