As an adult I can see that I was kinda stupid as a teenager. My excuse is that my brain chemicals were out of whack (even more so than normal for a teen) and there was a general failure to communicate between myself and my little sisters. The age gap probably didn't help. So most of the strips involving Mary's little sisters come from what my little sisters have told me years after the fact. If I had known at the time that they pretended to snipe passing cars on their way to school I may have had a different opinion of them.