My petition for my brother was approved in 1990 even though I gained citizenship through adaption,however, he was denied visa during a recent interview (20 Oct. 2013) because the interviewer believes that it wasn't legal (though it was before 1990, a bases for their approval) and that the length of separation (23 years) no longer validates our relationship as biological brothers. As I pursued their case over the last 23 years, I didn't received any letter of denial from National Visa Center, stating my petition were invalid or denied because of my citizenship gained through adaption. Please advise.
I think your title question is a very personal one and has to do with your ability to navigate a situation. It seems that you would definitely benefit from the competent legal help.
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This calls for examining all the documents involved. Find an attorney.