Your grandmother has suffered a brain stroke. High blood pressure, high blood sugar and cholesterol, etc are a few common causes of stroke. Early allopathic treatment could have helped your granny. But after 2 yrs chances of recovery are only minimal. Surgery is not an option in this case. Physiotherapy is all that we can do now. Early treatment and early physiotherapy give the best results. Surgery in selected cases is only to save a life but not to reverse paralysis.