The DTC is a federal program and does not affect or alter your status of other government or provincial programs such as OSAP/student loans, ODSP (Ontario), AISH (Alberta), Disability Assistance (British Columbia), etc.
Once found eligible for the DTC, and as long as you are under 59 (must be under 49 to receive Government matching contributions) you are also automatically qualified to set up a Registered Disability Savings Plan (RDSP). The RDSP is a long-term savings plan providing benefits in disability savings, grants, and bonds.
As part of the DTC, the Child Disability Benefit is a tax-free monthly payment (not based on Federal taxes paid) made to families who care for a child under age 18 with a severe and prolonged impairment in physical or mental functions.