Not affect your 姐姐 green card application,

来源: 于 2015-04-25 17:39:20 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次
but your 妹妹 may have big trouble if she overstays in US (she can not get the green card within US unless she marry a US citizen).