Not necessary.

来源: 于 2015-09-01 17:59:26 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

父母在我哥那儿呆了几个月回国，不到3个月再来我这里（我和我哥相距很远），入关时有没有问题？

-It should be fine.

我需不需要写一封给海关的信让他们入关时给海关官员看看，解释一下？

-No, but not hurt you to do it. If asked, then provide it. If not asked, not need to show it.