Yes, it's tougher if he associates both of you with feeding.
Have you tried watering down his nighttime bottles? The theory is that if he only gets water at night, he doesn't bother waking for it. This has worked for others, though not for us (perhaps because he is breastfed? I don't know.) I'm not convinced, personally, because if the problem is that he doesn't know how to settle himself, how will he go back to sleep? But, like I said, it has worked for others.
The No Cry Sleep Solution has many good suggestions, but I suspect you're already doing most of the things suggested in it. Certainly worth a read in the library to see whether you want to buy it. Ditto The Baby Whisperer.
I'm not clear which ds was in hospital. If it was this one, is he fully fit now? If it was the other, could this one be having a flare-up of separation anxiety as a result? Though, TBH, whichever the case, I don't think you ought to stress him too much in tryign to change the situation. I know how tough this is for you because I am living it too! IMO I don't think you'll be able to change it without some crying, but, if you can bear it, letting him cry with you in the room (so that he is not abandoned) will, I'm sure, help. Tell him 'No nonny, lie down and go to sleep now'.