Hello, Recovery post stroke depends on many factors like Area of brain damage How much big is the damage level of spasticity age of patient presence of diabetes or any other disease Since your brother have sensations with physiotherapy rehabilitation and assistive devices it is possible to achieve at least 60℅ of activities. He can regain most of the movements at shoulder,elbow and wrist but control on fingers will take long time comparatively. Also if he takes active participation in the rehab with strictly following the home protocol the faster recovery he will achieve Hope this helps you and for any further assistance feel free to write back thank you