A mistake in the I130 application when should the attorney intervene to correct it ?

You should intervene as soon as you are aware of the mistake.

IF USCIS DENIES THE I130 APPLICATION FOR ONE MINOR MISTAKE , DO THEY ASK US TO REFILE AND BECOME AT THE END OF THE LINE??

Has USCIS actually denied the I130 for a minor mistake?

I agree with my colleague. It is best to file a FOIA request with the appropriate agency to determine the basis of this cancellation.

You will receive a 10 year green card if the length of your marriage is more than two years at the time of approval.

on F-1 visa, Son is US citizen who has filled petition for GC. do i still need to enroll in class while app is pending?

Given the basis of your application, falling out of status should not detrimentally impact your adjustment of status application.

Best to refer to the form instructions carefully.

No this will not adversely affect any future immigrant filings.

Yes it is best to work with a Lawyer for such a response.

How long for a Student visa person to bring spouse from India ?

Yes your spouse may enter on a F2 dependent visa.

EADs are still being processed at normal times. Check USCIS webpage for case processing times.