Here "breath" represents the smell of his breath. If something is offensive to someone, it means that he hates it. AT: "My wife hates the smell of my breath" (See: [[rc://en/ta/man/translate/figs-metonymy]])
Job refers to his brothers and sisters this way to imply that they are people who should love him. The full meaning of this can be made clear. AT: "my own brothers who should love me" or "my brothers and sisters who should love me" (See: [[rc://en/ta/man/translate/figs-explicit]])