Vigil for Midnight

The cats held another vigil for Midnight Friday morning.  Emily climbed to the top of the cat tree and surveyed the area.  She looked at me very sad and confused.  She went over to the sofa and laid down in loaf position on the arm.  Molly came and laid down on the plaid throw that Midnight was partial to.  They laid there together being quiet.  This is clearly a demonstration of social ties, emotions and memory in domesticated felines, and it upsets me every time I see them do this.  I so wish I could bring their sister back well and happy to them.