Hello:
Yes, you can claim your brother. He is a qualifying relative - the following excerpts also apply:
Please review the full details in this link to confirm all is met: https://turbotax.intuit.com/tax-tips/family/rules-for-claiming-a-dependent-on-your-tax-return/L8LODbx94
Hi Gs02rosa,
The answer could be yes as a "Qualifying Relative" as long as you provide more than 50% of their support, they live under your roof for more than half the year, that you cannot be claimed as a dependent by someone else and a myriad of other potential factors.
Read further under "Qualifying Relatives":