Lisa looked up at Will and Rodney with a perfectly pleasant expression and advised them, "Walk carefully. Stairs are dangerous."

And then returned to her cookie decorating, whistling happily.

Robbie quirked a curious eyebrow and made a note to find out what that was all about. He also just barely managed to keep a straight face. So, that was what his father had meant by being worried that Lisa was spending too much time with Tasha.