Filing an AR11 to change your address should not have any negative affect on your I-130 petition for alien relative application.

Realistically the only way you can find out is when you hear from him or someone else who knows his whereabouts and current situation.

If you have not in any rush, you can file with USCIS. If it is a rush, you should try going through the consulate.

If they are all on one form, you should be able to include all of them on the I-134 or to write a letter and provide your proof of income.

You would need a waiver to come to the U.S. because you have been convicted of violating a controlled substance law or provision.

it will be faster if they are already in the U.S. If you will have to commit fraud in order to get them to the U.S., then you should simply file...

Generally, the sooner they file, the sooner the visa will be available. You can check the visa bulletin for the availability dates.

If you have a work permit, it seems to me that you are permitted to work. Ask your J1 administrator if working, with a work permit, would violate...

I hope you mean 2024 and not a year ago. Anyway, no, the last action was the change to F1 and that is your status. If you do not enroll, you will...

He can live wherever he wants. It is not hard to notify USCIS of his new address. His lawyer also will get copies of any notice.