I'm a little frustrated because I was trying to find a thread on this forum of a conversation I was having with a dad about his two step-children. Apparently they keep playing with fire and the only thing the parents could think of to do was ground the kids. For some reason, I couldn't get it out of my head to tell him to take them to the local firestation. You can call them up and explain that your children need to learn about fire safety because they are not getting the message, and they will allow you to bring the children by and give them a lecture. Children respond well to authority like that and it's much more sensible to teach them a lesson than to ground them, which only makes them more resentful.
And, YOU ARE DOING A WONDERFUL JOB! It's so hard to have step-children and I commend you for wanting to find a solution.
For everyone else, I guess it's just a helpful tip:)