I’m an U.S citizen and Sponsor of my husband who has obtained a 2 year conditional green card.

He may apply for a reentry parole permit.

Yes. It will depend on your income and household size.

Can I apply a fiance visa for my partner even though she had a revoke visa last 2 yrs ago?

Yes. You may petition your Fiancee.

I was sponsored by my sibling in 2001 and accepted in 2004. How long do I have to wait for my green card?

Sibling petitions can take a long time. And it depends on your country of birth. It could be anywhere from 14 years to 22 years.

OPT /Green card

You may file the I-765 and I-485 concurrently.

Will she be denied citizenship and lose her green card?

From the information you gave, it looks like she is eligible for citizenship.

I-485 was approved then reopened the next couple hours?

It seems like your card was approved. You should check the I-485 case status online and/or call USCIS.

Do I need inadmissibility waiver?

I would suggest to have a consultation with an attorney and give more information about your F-1 visa. If you entered with a visa, you could be...

Do I need a new visa?

Normally you would need a new application for a new employer, but I would need more information on your case to give you an exact answer.

Can I apply for a J1 au Pair visa for a second time, after extending it, if the 2 year rule does not apply?

Yes, it is possible to be an au pair more than once.