Tim places himself third in importance, so it's more of the same. More more, probably, as Tim gets older and, therefore, to the Drakes' thinking even more self-sufficient. The reality is that third is inflation. They're pretty busy, with their company, and their digs, and their impromptu vacations, and the charity circuit... anything that isn't Tim.

But keeping himself fed, not burning the house down, and making sure no one knows what goes on in the Drake household is all one needs to be self-sustaining. "And how's Mrs. Mac?"