Since it would not be easy - 回複:請問:外婆生病住院可不可以申請emergency AP? 怎麽
to get your birth certificate and your mother's birth certificate to prove such relationship, I would just walk it to explain the situation so as to get an emergency AP.
http://web.wenxuecity.com/BBSView.php?SubID=immigration&MsgID=369631