---I think you'd better prepare one. I was asked to resend a invitation letter since my parents-in-law were not able to get visa before the date I mentioned in my invitation.
2)我将要生孩子了,我们在给签证官的信里说明了这点,(也是为了说明为什么我们在过去几年里没有回去过一次,因为一直都有事)还有我们最近照的三口之家的全家福也显示了我的大肚皮,很温馨的照片,我认为会给我们加印象分,所以也不想放弃。不过我在邀请信里说明了我是全职在家的妈妈,所以我父母在美国只是充分享受他们的美国之旅。 大家说这点仍然会是一个签证通过的障碍吗?
--I don't believe it is a good idea.If I were you , I would try not to mention the pregnancy thing.
两年前父母签证没过,这次真的希望父母能过来。
--Good luck.
谢谢!