父母在我哥那兒呆了幾個月回國,不到3個月再來我這裏(我和我哥相距很遠),入關時有沒有問題?
-It should be fine.
我需不需要寫一封給海關的信讓他們入關時給海關官員看看,解釋一下?
-No, but not hurt you to do it. If asked, then provide it. If not asked, not need to show it.