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I am sorry to hear this.
Did your husband leave a Will?
Has a probate case been filed yet?
The brother is not acting legally.
You are the closest surviving relative, not the brother, and you can file a probate petition asking the Court to appoint you as Administrator of the Estate. Once that is done, you will be the only person who can legally gain access to the storage unit, and you can sue the brother to recover any items he wrongfully stole.
You can ignore the brother's demands. Once an Administrator is appointed, you can tell the brother to file a claim against the Estate,
You can get a free consultation from some of the California probate attorneys listed by location here.
Please follow up on this with a local attorney.
I hope this information is helpful.