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他们已经买好6月底回国机票， 现在file I-130 和485 还有944 等到一起批下来可能要大几个月，恐怕也来不及。

-Even if they overstay in US, it will not affect their I-485 aprpoval, i.e. their illegal stay does not matter in their case because they are the immediate relatvies of you, a US citizen.

 我们是北京人， 能否在北京办理而不是广州呢？-No 还有， 能不能先交 130， 485 还有回美证， 然后之后补交 944 可以吗？-Probably no. USCIS requires that the applicant needs to provide all of the required documents at one time. 谢谢！！