Hi Parul, my husband had LMCA stroke..he is suffering from Aphasia. I have been making him do vowels a,i,e,o,u..to speak in one breath along side timer. Make him blow baloons, whistle, use straw for drinking water. Use flash cards for words and objects..i have got some primary level grammer books for him to make him recall usage of language and words. I make him play board games..chess, ludo and cards..his responses have improved.although not too much but maybe with time it will.. Maybe this will work for your brother too.