Good afternoon. Welcome to HCM. I have carefully gone through the medical history of your brother. He seems to have lesion in the dominant hemisphere (left posterior parietal cortex) . Right now he should be taking his antihypertensive medications if he has hypertension and other medication prescribed by his doctors. but to regain power and speech, most important is physical rehabilitation and speech therapy. there is no guarantee of hundred percent return of normal function but he can regain some motor activity and speech function too. This process takes time from weeks to year. So it is recommended to start physical rehabilitation and speech as soon as possible. and also followup with your doctor as knows the full history of your brother and the factors leading to stroke.