The Flash lead Kid Flash in behind the Batmobile, shaking his head (as he always did) at the enormity of Bruce's operation. He just worked out of a fourth floor apartment.
"Bart," He said when they came to a halt. "This is Batman's home. Respect it." it was supported by a soft but restraining hand on Kid Flash's shoulder.
The Batman proposed a DNA test.
"Yep." Barry held up the two, sealed samples he and Bart had already provided. "Way ahead of you, son."