请问8老师， 我准备邀请妹妹来探亲并参加孩子的毕业典礼。 除了邀请函之外我还需要提供其他文件吗？谢谢！
-If your sister has her personal money to cover her travel, you just need to provide the invitation letter (she needs to provide her financial ability proof for the visa interview in this case). If you need to provide financial support to cover her costs for the travel process, you need to provide the completed I-134 with the support documents (see I-134 Instructions) to her for the visa interview.
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