DaniG

Other evidence can compensate to for the lack of joint financial documents, that's a good list up there. I'll add medical records listing each other as emergency contacts, 401(k) docs if they list you, and any record of payments for your/baby's bills that show they were paid out of one of his accounts. You could also open a joint account now and keep it until you're done with the ROC & citizenship process, where you keep a little bit of money to pay for groceries, or expenses related to the birth/child, and still keep the bulk of your finances separate (You could even open one for you as the primary holder and just add him as an authorized user - can't stop you from doing that). This would give you a few statements to show USCIS. They don't care about the amounts in the account but usually do want to see that some co-mingling exists and might give you a harder time if you don't have it, so I personally would try to offer them fewer reasons to complicate things (but that doesn't mean you won't get your permanent GC - if you have a bona fide marriage and are not criminally known, in the end you WILL get it).
If you write exactly what the RFE says and list what you already provided, I'm sure people here will come up with additional ideas of what to send the immigration folks.
On a personal note thought, I would not be comfortable with my husband keeping all his finances and property separate, especially if kids are in the picture, even if he is good about providing for us and I earn enough on my part. In the event something happened to him, it would be a lengthy probate nightmare to get the property and would result in a lot of fees and taxes (taxes because you are not a USC) that are otherwise avoidable to be paid out of the estate, and might even make funds and assets that you need for your children's daily needs & education unavailable until they become 18. I'm not familiar with your situation, and maybe he has good reasons for doing what he is doing (e.g. ugly divorce with ex would make anyone extra-cautious), but I would very strongly suggest he consult with an attorney (if you guys haven't already) to make sure things are handled in the best possible way, which is possible with separate finances but not as straight-forward.

Ms. Dawn, maybe you should consult with a lawyer who would weigh the particular evidence in your case that shows your initial intent to return to HK when you entered the US on a tourist visa (such as hubby adjusting to a resident there, still paying rent or having property there, still having a job there, etc.) against the possibility of denial for supposedly misrepresenting your non-immigrant intent.
I think a lawyer would be better able to judge how convincing it appears that you were intending to live permanently in HK but suddenly changed your mind when you came here than a forum full of people who know only that you got married before you came to the States. Still, what the others have pointed out is a real possibility, so act carefully.

Ms. Dawn, maybe you should consult with a lawyer who would weigh the particular evidence in your case that shows your initial intent to return to HK when you entered the US on a tourist visa (such as hubby adjusting to a resident there, still paying rent or having property there, still having a job there, etc.) against the possibility of denial for supposedly misrepresenting your non-immigrant intent.
I think a lawyer would be better able to judge how convincing it appears that you were intending to live permanently in HK but suddenly changed your mind when you came here than a forum full of people who know only that you got married before you came to the States. Still, what the others have pointed out is a real possibility, so act carefully.