I'm confused. Why does leaving the house mean you won't be alone? You know how to drive, right?

I'd like to add to my suggestion; you make your arrangement with Scott a regularly scheduled event. Saturday afternoons (or whenever) Scott and Kid go do X, Y, or Z together. That way they get used to Their Time and you'll know every week when you can expect some time alone.

PS...I'm glad some of the original post was helpful. :)