Family member international adoptions are in theory easier than non-relative adoptions. From the US side, you will need to contact CIS to get paperwork going on a visa for the child. The adoption will need to be handled in Brazil (unless the country allows citizens to be adopted after leaving the country), so you will most likely have to handle the actual adoption in Brazil with an attorney and/or adoption agency there. Once here, again depending on the degree of finality had in Brazil, you may need to "re-adopt" -- which is somewhat less complicated than an actual adoption but will cost roughly $4,500 -- if you do it alone.
THE LAW OFFICE OF STEPHANIE WHITE
Simi Valley, CA
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Brazil is a party to the Hague Convention on Intercountry Adoption. Therefore, you will need to comply with the Convention requirements and U.S. law regarding the Convention. You should start by reviewing the Department of State website regarding the Convention and adoption from Brazil.