Mere Baba jaan ko Paralysed Ho gaya hae isi Wajah Se Unka Dimagh bhi sahi tarah se kaam Nahi kar pata hae to wo namaz nahi padhte hae,

kya mae unki namaz padh sakta hu,

Agar nahi padh sakta to kya hukm hae mere liye

by

No you cannot pray on his behalf , if he is aware he can pray by pointing with finger ISHARA , if he cannot pray with his finger , then one should count his qadhaa and offer it after him.