回複：請問：I140已批，H1明年4月要延期。。。

You need to make a decision on this.
Usually, most of people will choose to renew H1B, since if you keep your H1B, then even there is anything happen with your I-485, you still have legal status for working and staying. Yes, at the same time when you renew your H1, your spouse and children will also need to renew their H4.

If you use your EAD, then you are not H1B any more, you are I-485 pending. If your I-485 is approved, then everything is okay. If your I-485 is denied, then you ( your whole family) will need to leave USA immediately.