Think you carry both to show immigration. Not sure if passport office gives you anything else to show. Think you then transfer your extension to new passport. Wait for admin.
I'm really sad to hear your relationship was so dreadful. But a child, no matter what age, has to live with the pain of parents that are desperately unhappy and "hate" each other. I hope you can be there for your son, they are always our "babies" no matter how old.
It took a while but I got one eventually. Not unlike Thailand. In UK banks don't open accounts for tourists but people seem to complain about Thailand mostly.
so as a foreigner in USA you found it easy to open an account? I didn't. I was refused because, amongst other things like Thailand, they required a long term visa.