A Watch in The Window

The most heart-breaking thing about the recent loss of my beloved Sam is trying to comfort his little buddy brother, Max-the-cat! Every night for the past week since Sam's been gone, Max waits in the window all night long, looking for his buddy! I call him & he comes to me & sleeps for a little while on the sofa (we don't sleep in the bedroom now) but always returns to the window to keep his watch. He knows something has happened but can't explain it...neither can I.