Answer:
As a brother, your responsibility is to look after his physical and spiritual needs. It is your responsibility to educate him of his Shar’ee obligations that specifically refer to the disabled.
In order for you to know this, we suggest you consult a local Aalim (learned person) nearby who may assist you in this regard.
and Allah Ta’ala Knows Best
for: Mufti Ebrahim Desai
FATWA DEPT.
CHECKED AND APPROVED: Moulana Imraan Vawda