I did it!
We thought it would be a good idea to take the training wheels off Mallory's bike, too, and make a little contest out of it. Of course, to be fair, at the time we thought they were going to be about equal in terms of how long it would take them to learn... Mallory has since conceded that the prize ($10) should go to Drew. She was enthusiastic up until she actually got on the bike and realized it was something she was going to have to work at. It might be time to encourage her to ride the scooter instead (I'm not sure how much of her whining Bryan can take, lol).