This deduction is available to all Residents Individual or HUF, for medical treatment of disabled dependent relatives. In case of Individual - Disabled dependent can be Spouse, Children, Parents, Brother/Sister (siblings). In case of HUF - Any member of the HUF Disability under section ...
Discussing Deduction in respect of maintenance including medical treatment of dependent that is a person with disability [Section 80DD] and Deduction in respect of medical treatment, etc. (Section 80DDB).