Getting kids to US born before AOS on EB1 and post GC conditions on EB1C

[Vamshi Damera]

Hello Rajiv ji,

Here is my situation.

1. i got my I-485 approved on April 2016 thru employment EB1 category and both me, wife got GC.
2. We got our children (twins) on March 2016 in India a 25 days before a became a Permanent Resident.
3. I am back in US and filed I-824 follow-to-join. My wife and kids are still in India

Questions:
1. How long does it take to get I-824 approved and steps involved
2. can I bring them on B Visa or any other Visa while I-824 in processing. If so, do they need to leave US once I-824 approved and come back thru consular approval again ?
3. is there any premium processing for I-824
4. How long my wife can stay outside US as she got her GC in April 2016 but she traveled to India in Jan 2016 on EAD, which was valid then until Jan 2017. This is in case my kids i-824 takes longer and my wife's status may also be in risk.
5. Also are there any post GC conditions on EB1C as continuing with the same employer, any revocation conditions and consequences.


Thank you very much Sir for your help.