Jack has taken, for about the last 6 months, to saying unless when he means if. I'm not sure how to help him. I'm currently trying shouting "if" at him each time he says unless incorrectly. I tried ignoring, which might have made it worse. It's really strongly in his brain incorrectly. Yesterday, we were making up silly versions to If You're Happy and You Know It. He had been singing along correctly, but when he went to offer a suggestion he said "Unless You're Happy"... If you have any idea to help remap his brain, I'm all ears!