Upstairs: Hakuna guards the top of the staircase against Unwanted Intruders.
Downstairs: Neighbor protects a comfy armchair against Unwanted Intruders.
No, it ain’t Masterpiece Theatre. Just our kitties, and their shaky Modus Vivendi. When one is upstairs, the other generally is downstairs... and vice versa. For when they find themselves in the same general area, complications ensue.
Servants and aristocrats would likely get along better than these two. Alas.