Hello, you haven t included enough details to completely assess your father s situation but I ll try to give you some ideas. First of all, is he on treatment for TB? TB is a deadly disease if left untreated and contagious too! All your family should be tested and treated depending on the results. His blood sugar won t get any better easily because diabetes gets worse when during the course of another disease. His blood sugar levels would likely be hard to control without insulin. A good diet is essential as well but considering his TB problem this is not the main issue. I couldn t give you more specific advice because I do not have enough information for his condition. For example: does he already take any medications for diabetes? What are they? Any other medical problems and treatments? Does he take anti-TB treatment? What about other risk factors like his blood pressure, cholesterol levels, smoking status etc? I hope I ve given you something to consider. If you need more information, please ask again including more details about your father s condition. Kind Regards!