if I apply 延期for them, will it make their next visa application harder?

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yes. heard numerous stories. why not take it easy to try a few months first?

我爸妈刚来,他们的签证是一年多次往返的,海关给的是半年的stay,好像基本现在都是这样的.你可以让爸妈办延期,不过那样他们下次签证肯定会收到影响的,最好还是不要吧

That is so good to know! So I could bring them to vacation in Mexico or Canda then enter the custom there to get more stay time.

Dear mm, did that affect your parents' visa application the next time when they applied in China? I heard that you need to stay in China for at least the same time if not longer than the time you stay in US before you apply for visa again. Otherwise, the visa application will be hard. Is it true?

我父母他们也考虑到这一点，所以都是在中国又呆了一年，再去签证的，两次都很顺利。

我觉得如果在美国呆的时间比在国内长，证明在国内的关系不够牢固，签证官会担心不回国，应该是有影响的。