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I agree with others that the best thing to do, if you can afford it, is to see an elder law attorney who specializes in Medicaid planning. Check out naela.org to get some names in your area. Alternatively, I recommend contacting a P.A.C.E. provider in your area, if there is one. Hopefully, your brother will qualify through Medicaid (they will figure it out) or he can afford it outside of Medicaid.
Usually when they look at expenses coming out of his bank account, they are looking for whole check deposited and then withdrawn. Or possibly a large amt pulled out of his money each month. Those can be investigated as gifts to someone else.
Just let his money go in his account and use the check ledger to write down each expense out of his money. Whatever he needs will be ok - supplies, food, maybe where he paid a provider at a drs office or someone that came to the home.
For myself as former banker, I like crunching numbers, so I will keep all bank transactions and receipts for 30 months lookback period in CA State. Although I am just 67 and very active, no one ever knows what can happen to land one into expensive care at home or a facility: be it fall injuries or a sudden illness.
If he is paying "room and board" that is an acceptable expense
clothing, personal items (soap, toothbrush, hair cuts, )
Medical expenses, including medications both Rx and OTC
Medicaid rep would be able to give you more detailed info
If he is paying you for your care you should have an agreement or contract.
Save all receipts.