You have to be an immigrant to the USA, to understand this 
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My friend, Hareesh, sent this posting on an online forum related to immigration matters
I am so HAPPY today. My lawyer told me that my daughter can sponsor both me and my wife once she is 18. She is only 3 now, so thats 15 years away only. It would have taken 20+ years with my EB2-based case (PD May 2008). I am so HAPPY today.