You can file form G-639 under the freedom of information act to get a copy of the Immigration file. the form and instructions is found at www.USCIS.gov "forms" but it can take up to one year to get the information. In addition, right now they are working on applications they received in 1996 so his visa was already available a few years ago and since you failed to apply or keep in touch with them, the case would be closed by now and you would have to start all over again. For the other siblings if you file now, it will take 16 years for them to get a Green Card through you since there are no visas available right now. I hope this helps clarify.

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