I have savings bonds in my name that were given to me by my deceased parents to care for my developmentally challenged brother. My brother is 87, on Medicaid, and welfare, with no assets, small social security monthly check, which covers his rent, and I cover other expenses for him. Right now he's on lists for 4-5 years because he needs subsidies to help pay.
If the issue is "What happens if you predecease him?", then establishing a trust on a current basis, but certainly a testamentary trust (one that is created at your demise), makes sense as you do not want him to inherit anything that would disqualify him for public benefits.
Your estate plan can be structured so that your Will (or revocable living trust), creates an irrevocable trust or irrevocable special needs trust for your brother's benefit at your demise (this is the aforementioned "testamentary provision"). In either event a trustee will handle the funds.
The decision to establish a trust now and transfer funds, or for it to happen on a testamentary basis may be based, in part on tax issues. Savings bonds held for long periods of time may have large taxable gains. Be mindful of the tax effects of liquidations/gifts/inheritance/trusts.
The goal, of course, will be to preserve public benefit eligibility and to have a third party managing his financial affairs.
The above is information available to the general public, is provided for informational and educational purposes only, and should not be considered financial or legal advice.