请问：
（1）我父母是办旅游签证还是探亲签证？我叔叔和婶子应该办哪种呢？
-All the same: B-2 visa. Reasons: 探亲 plus 旅游. You (or/and your spouse together) issue a invitation letter to invite your parents to visit you and tour; and you issue another invitation letter to invite your article's family to visit you and tour in US.
（2）一起办好？还是分开办？
-Go together, nothing needs to be hidden.
（3）我的绿卡正在办renew,这个会不会对他们签证有影响？
-Not at all.
（4）目前办理签证都需要什麽？有没有哪里有办理这个的材料整理？
-Read this website of US Embassy in China:
http://www.ustraveldocs.com/cn_zh/cn-niv-typeb1b2.asp
（5）需要邀请函吗？-Yes. See above.
(6)有什么硬伤需要注意的吗
-I don't see it in your case.
（1）我父母是办旅游签证还是探亲签证？我叔叔和婶子应该办哪种呢？
-All the same: B-2 visa. Reasons: 探亲 plus 旅游. You (or/and your spouse together) issue a invitation letter to invite your parents to visit you and tour; and you issue another invitation letter to invite your article's family to visit you and tour in US.
（2）一起办好？还是分开办？
-Go together, nothing needs to be hidden.
（3）我的绿卡正在办renew,这个会不会对他们签证有影响？
-Not at all.
（4）目前办理签证都需要什麽？有没有哪里有办理这个的材料整理？
-Read this website of US Embassy in China:
http://www.ustraveldocs.com/cn_zh/cn-niv-typeb1b2.asp
（5）需要邀请函吗？-Yes. See above.
(6)有什么硬伤需要注意的吗
-I don't see it in your case.
