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Is your brother the executor?
Hello and thank you for your question.
If he is only a joint executor he cannot on his own force you to pay rent etc, though with the support of the third sibling could demand it. Alternately he could, as a beneficiary, apply to the court for orders in which case the court will likely require rent be payable a reasonable time after probate is obtained. Essentially the court is unlikely to order you to pay back rent and likely will only require you to pay rent after you have been given a reasonable opportunity to find alternate accomodation, after which, if you choose to stay, you are likely to be held liable to pay rent to the estate reflecting the commercial rate of the property.
I appreciate this is not quite the answer that you were likely hoping for, but it does reflect the law as it applies to your situation.
Good luck and PLEASE RATE MY ANSWER.