Eligible diseases

Raju (CA ) (42 Points)

09 July 2017  
We have a client who's own siblings are dependent on him (they are dumb and duff from birth) can he claim deduction u/s 80DDB.. Or under any relevant provisions of chapter 6A and specify whether He is eligible for deduction On both of his siblings

if eligible then please specify the quantum of deduction and conditions to be fulfilled