My husband's case was under appeal and now it has been remanded because of the I-601A waiver becoming rule in March.

As mentioned, I would need to see the remand to fully evaluate what is going on, but yes, during the I-130 and 601/A process he can remain in the...

How can I get my German dual citizenship? I was German citizen 1950 to 1961 when mother got US citizenship. .

Based on your limited fact pattern, you can't do both. You will have to choose one or the other.

Hire an attorney and allow him to decide how he wants to proceed. That is why you are hiring an attorney.

My Husband has full custody of my ss 7. How can I go about adopting him in the state of GA without having to pay over $500?

Based on the limited facts you have provided it would be difficult to terminate the parental rights of the mother without her consent.

My Husbands ex girlfriend is now seeking child support from him

Short answer, No. Is there a court order for child support? If so, she may file a contempt action against your husband but not you.

My divorce hearing is in 3 days and I'm afraid my wife, whom lives in new york won't show for the court hearing.

There is a significant amount of information missing as to a custody determination, although you have mentioned quite a few issues in your favor....

What happens when I apply to renew my country's passport when I am out of F1 status in the US?

As mentioned, ask your embassy.

Can a parent sue an adult child for parental support?

no, just added effect to a previous reply.

After 180 days in Immigration Detention Center what is the next step?

As mentioned, you need to get an immigration attorney. With a previous removal order and no motion to re-open and motion for a bond hearing after...

Reapplying for green card after abandoning it (person worked and accumulated wealth in a foreign country as NR alien.)

I don't think the tax issue is the biggest problem. You are an LPR and he abandoned his so would need to refile. He would be an F2A and subject to...