You can use TurboTax Desktop\CD to prepare your brother’s return. He does not need to file Form 8689 if he lived and worked in the Virgin Islands all year. Form 8689 is used to split U.S. and USVI income.
As @harrpatr said your brother would also have to file Form 1040SS, which TurboTax does not support. You will have to remove self-employment tax form from page 2, line 23 of Form 1040 (it will be reported on Form 1040SS). That can be done with TurboTax Desktop\CD.
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