SSI (Supplemental Security Income) provides supplemental income to persons with 
significant disabilities who are not working or are unable to generate an adequate income through employment. Each eligible person is entitled to receive monthly checks based on current federal payment schedules. If a person is determined eligible for SSI/SSDI, then he/she is usually eligible for other programs such as Food Stamps or Medicaid. However, you may have to apply for each program separately. 

Eligibility includes a physical or mental disability that is expected to keep you from substantial gainful activity for at least 12 months and limited income and assets. When a person is 18, his/her own income and resources are taken into consideration, not that of the parents. Individuals may apply three months before turning 18. 

Because eligibility for SSI benefits is based on the assets of the child, it is important that parents plan carefully for the financial security of their son or daughter. If a person has assets over $2,000, consider setting up a Special Needs Trust.

Trusts and wills need to be set up by professionals who understand disability law. Your family attorney may not be well versed in this area of the law. 
www.socialsecurity.gov/denver/
1-800-772-1213

Learn more here: Long Term Care Options