You will be allowed FLAT DEDUCTION OF RS. 75,000 (in case of Person with Disability)/ 1,25,000 (in case of Severe Disability).
Further, this deduction does not get affected by the number of persons with disability. And also, this is a FLAT DEDUCTION which means even if you have spent less amount (say 10,000/- or even less) then you will be allowed Flat 75,000/1,25,000 deduction depending on the Disability criteria.
Severe Disability means any person with 80% or more disability as mentioned in the certificate given by the medical authority.