Well my wife made through her first day alone (yesterday) with the 2 critters without shooting me when I got in from work, so I guess all is well. I'm crossing my fingers that today goes just as well. Thanks everyone for the kind words.
We're pretty certain we are done. I think if we do anything, we might adopt later in life. So far the plan is not to have any more. I reckon my wife will let me know if I'm sticking to my decision or not.