Originally Posted by DBug:
I feel you OP -- it's too hard on your own family to say yes, and it sounds like you've decided to say no, which is great. If it helps you feel better, why not give the parents a list of names of teen babysitters in the area, and tell them you'd be more than willing to let a babysitter pick up (with their permission, of course) at the regular pick-up time?
I know I've had parents that have mentioned that they need someone to watch their little one on the weekend, as if to feel out whether I would do it for them. I do NOT work weekends, but because I'm terrible with saying no, I always have a list of names on hand to give them 
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That is a great idea! I'm going to start this too. I know there are a few teenagers on my street who are always looking for new babysitting clients.
To the OP; that's a tough situation! I know in my case it wouldn't be possible to take the DCKs to extracurriculars because my own 4 kids take up all the seats in my van. I'm sorry you have to decide this.