OK, thank you for the clarification. And thank you for your patience as I clarified the information. Please note, this is for informational purposes only. My response does not create an attorney-client relationship. My answers are below.
Once you get your answers, please take the time to give me a positive rating of 4 or 5 stars. This is extremely important. Ratings are the only way I get credit for doing my job. So without a positive rating, it's as if I never showed up for work. Thank you in advance.
As to your question, your husband is not required to take on G4 dependent status once you go to G4 status. He can remain on H1B status. It would be as if you are two different people who have two separate and distinct immigration cases and statuses.
I hope I have answered your questions. If you want to talk on the phone for a fee, let me know and I will send you an offer.
Please remember that the only way I get credit for doing my job is with a positive rating. So please do that now by giving me 4 or 5 stars. If you have any additional questions, you can always continue to ask them, even after you've given a positive rating.
A BONUS is also appreciated if you feel I've earned one today.
And if you have new questions in the future, you should write FOR JAMES in the question. That way, I become your personal immigration Expert.