Unfortunately, there is no place in TurboTax to indicate investment income split with a joint accountholder.
Your brother will enter the 1099's reported under his SSN, and indicate 'adjustment' to report his amount, under 'Other Uncommon Situations'.
He will issue you a 1099 as Nominee for your portion, which you report on your return. You will need to do your own calculations.
Click this link for more info on Split Investment Income.
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