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It's appears that you have two separate problems. 1 is the concern for disqualification of Social Security disability benefits from your father's estate. 2 your brother's threat and family contact with Social Security regarding your financial information.
In regards ***** ***** first question, the answer will largely depend on whether you are receiving income from your father's estate or whether you are only receiving an asset. If you are not receiving income, or if the monthly amount is less than $950 per month, then you social security disability should not be affected. I would highly recommend reviewing your father's estate with your Social Security attorneys in order to attempt to structure any assets you inherit to allow compliance with receipt of disability award. If you have not yet received the asset this will be far easier to do. Even if you have received the asset there may be time to restructure if needed.
Regarding the second question, I would suggest filing a temporary protective order or restraining order against your brother or any other family member who has threatened you. This will prevent him from speaking to you and you can also put in provisions to prevent him from speaking to third parties about you. This will help eliminate him reporting information to Social Security disability or other agencies. I would also recommend discussing with your mother not providing any information to brother or other family members voluntarily regarding your father's estate or any of your finances. You obviously know that they will use any information they can get against you or lie about it. You need to isolate information from them wherever whenever possible. You need to get your mother on board with this idea of protecting information.
I hope this information devices helpful and I wish you the best of luck with this difficult situation.