Sorry for the delay. I have been trying to decipher what happened here, ad make sense of it. I think I've gotten it now.
Unfortunately, since the immigrant petition was approved prior to August 6, 2002, the CSPA does not apply to either son 1 or son 2, as derivatives of their mother's F4 case.
For the second son, he had to have another petition submitted on his behalf. His new priority date is October 2009, and therefore, he is considered an unmarried son (over 21 years of age) of a permanent resident (F2B). Therefore, he must wait for his priority date to become current, before he is eligible for the green card.
For the first son, mother needs to submit the I-130 on his behalf, just like for son 2, as the unmarried son (over 21 years of age) of a permanent resident. He will end up in the same category as son 2 (F2B). And like son 2, son 1 must wait for his priority date to become current, before he is eligible for the green card.
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