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我母親在美國沒有多少資產和收入。那將來如果我弟弟排期到了，簽證官會因為擔保不夠而拒簽嗎？我不清楚親屬移民的財產擔保要求。那時候我可以提供擔保嗎 as alternative？

-You can be the joint sponsor to provide the financial support at the time your brother files the immigrant visa application in the future.