I'm having trouble locating an attorney who specializes in Special Needs Trusts

I wouldn't think Mom's trust could be amended, if Mom is deceased (which I assume from the question). If the distribution is relatively small, it could be distributed early in the month and IMMEDIATELY spent down in the month of receipt, for large-ticket items such as a car, purchasing a funeral plan, television, new appliances, computer, etc. The beneficiary would have to report the receipt and spend-down. He would have to pay back one month SSI benefits. If the amount is in that range, please seek further guidance for the exact right way to do this. View Stephen Dale's video: https://www.youtube.com/watch?v=ZMr_RSJPDPU   If the amount is larger than around $50,000, it would be urgent to create a first-party d(4)(a) trust for his portion to be distributed to. If no one in your local area specializes in special needs trusts, someone could work with you remotely. My firm, and probably others, are able to do that. Administration of the trust will be critical as well, to avoid jeopardizing SSI or Section 8 in the future.