We are all speculating here but when I read this to my understanding I believe and hope for example my father was petitioned by his brother in 2003 .. and my grandparents are green card holders.. it says the waiver is available to son's and daughters of green card holders even if they are not the petitioners . But we won't know for sure until I think in January where lawyers will have enough time to dissect every thing . But the wording clearly means adult because before it said minor children .
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Date Application Sent - 8/21/2012/Delivered-8/23
Date of I-797 C Notice of Action- 08/28/2012
Date Biometrics scheduled - 9/24/12 Walk in: 9-13-12
Date of EAD approved - 10/29/12 Date received -11/03/12 Applied for S.S 11/06/12 Date S.S received 11/10/12