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You put the camera on a tripod. You put the camera on manual exposure mode so the exposure stays the same from one picture to the next. You take a picture of the background. Then you send the kids in with a step ladder and take a picture of them doing some pose on a step ladder, making sure none of their body is behind the ladder. Then you open the background image in GIMP, and create a new layer and paste the image of the kids into that new layer. And you get out the eraser tool and erase the ladder. The background image will show through where the ladder was. Just make sure that when you create the new layer, you do it as a transparent layer.
It's easier than typing this post. The hard part is carrying the tripod and ladder outside, and then putting them away again.
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