What adorable stockings.
I had to catsit my sons cat for 2 weeks this past summer and everything went just fine. I stayed with him for about an hour or two a day and he was an only cat at the time.
At least Corkscrew and Tibby will have each other to pass the time away which I think will make things much easier. I'm sure you are going to miss them though, big time.
Hope you have a great holiday with your family.