You could claim them still as a qualifying child and file as Head of Household over single if they meet rules of permanent and total disability. They are eligible as children still regardless of age. Dependent can help you get EITC, Child & Dependent Care Credit. Also any special needs for food and therapy can be claimed as medical expenses if you itemize. https://turbotax.intuit.com/tax-tips/disability/video-tax-credits-for-disabled-dependents/L7fCh4fpU is a short video you may want to watch. There is something called ABLE where you can put money for disabled children aside for tax free growth. It can't be touched by SSI.... Read up on ABLE here https://turbotax.intuit.com/tax-tips/health-care/what-are-able-accounts-tax-benefits-explained/L38O9...
I hope this was helpful?
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