you can submit the extension request now but it may not get approved before the leaving date on your old I-94. Your parents still can stay in US legally as long as the application is in reviewing.
c*u
6 楼
额,我看成了半个月。。。。
【在 az 的大作中提到】 : 两个半月来得及,多长时间批准可就看运气了,短的不到1个月,长的3个月+的都有