My younger brother doubts everything.He portraits eldest brother as enemy .we try to convince him many times ,still he does same irritating things every time.one incident I want to share that recently he has done shoulder replacement,doctor advised for physiotherapy. He used to tell false things about physiotherapy and told physiotherapy doesn't work.when we enquired to doctor ,the scenerio was different.doctor told he is lazy person.He misbehaves with everyone.kindly guide how to manage him.