Look at the fierce concentration! The straight-haired girl came running into the house yelling, "Mom, you've gotta come outside right now! She is riding my bike!"
Tim had taken the pedals off of the curly-headed girl's bike so she would gain some kind of confidence in her ability to balance. She was not really using the training wheels, but she would not trust us that she could ride without them. So he took them off right along with the pedals.
It worked. Yay, girl!