-Yes, it may be helpful.
2 聽說不領結婚證也能去簽證,可以嗎?
-Ok, but the VO may ask why your friend invite her to visit US without any relatioship to your friend's family. So, she has to find some kind of reasons.
由於涉及到遺產等問題,老倆也不太願意結婚。
3 他們現在領結婚證,然後馬上簽證,會不會很容易被拒?
-It shoild not be a problem as long as they convince the VO they will return to China after they shortly visit US (no immigration intent).
3. 簽證官的係統裏有我朋友父母的信息嗎?如有,是不是她當時來美的時候交的表上的信息?
-It is irrelevant to the visa application. They only need to show the relationship between your friend and her father (kid and parent), and the marriage relationship between your friend's father and his new wife (this prove the laddy is your friend's step mother, so your friend wants her to visit US and thus they can know each other).