Uncle Jimmy barely makes any impression, so Scout says he might as well not even be there.
Scout is not concerned about Jimmy, because he is barely there. He never makes any attempt to get involved in her life or interact with her.
I suppose I should include Uncle Jimmy, Aunt Alexandra's husband, but as he never spoke a word to me in my life except to say, "Get off the fence," once, I never saw any reason to take notice of him. (ch 9)
When Scout finds out that Jimmy is staying behind while Alexandra stays with them, she realizes that her aunt won’t miss him. They seem to barely talk to each other, just as he barely talks to her.