回複：你爸需要10+年有可能綠卡，綠卡至少5年後有可能成為公民

Why need 10 years? Citizen's brother now cut-off 2000. but the dad already in the line for 6 years. the green card dad can sponsor under-aged why need after another 5 year after become citizen?
but I agree he likely need ten years, if not reaching 21 at that time. but not the dad.