Let the hoomans make the move, and let the fur-kids adjust to it and work things out themselves. They probably wouldn't go along with any of your plans, anyway, because they wouldn't understand any of the logic. It would be interesting to see what would happen if you just let them figure things out for themselves. They will anyway, won't they?

I may be totally wrong here, so ignore this message if you don't agree with it. I'd like to know how it all ends up!