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我母亲在美国没有多少资产和收入。那将来如果我弟弟排期到了，签证官会因为担保不够而拒签吗？我不清楚亲属移民的财产担保要求。那时候我可以提供担保吗 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.