楼主应该是公民或PR吧, 先担保旅游签证, 入境给30天, 等差不多半个月再给小妹妹延30天, 差不多能呆快2个月。89天的那种必须要亲属关系, 你妹妹可以, 妹妹的孩子应该不可以用你做担保人。ICA原文You are a foreigner with family ties where your immediate family members are Singapore Citizen or Singapore Permanent Resident and you are able to furnish original supporting documentary evidence to establish relationship;