You, the petitioner and your brother, the beneficiary, should both complete, sign and submit a G-325A and attach them to the I-130 petition. I would also recommend consulting a qualified immigration lawyer for assistance. Good luck.
You are only required to file a G-325 when filing a petition for your spouse. Period. One is clearly not needed in your situation. Please don't create any needless complications to yourself and petition.
Behar Intl. Counsel 619.234.5962 Kindly be advised that the answer above is only general in nature cannot be construed as legal advice, given that not enough facts are known. It is your responsibility to retain a lawyer to analyze the facts specific to your particular situation in order to give you specific advice. Specific answers will require cognizance of all pertinent facts about your case. Any answers offered on Avvo are of a general nature only, and are not meant to create an attorney-client relationship.
The form has very detailed instructions on www.uscis.gov/forms
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There is no need to file the G-325 as it is not required for the petition that you have filed. There is no benefit to be gained from submitting it, and you could cause problems for yourself instead.
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