Those are solo whitewater boats - not meant to be paddled tandem. As others have said, they will not go straight at all until you learn the proper technique.
If your kids don't want to mess with learning how to make them go straight, you could probably sell them by posting an ad on http://cboats.net/cforum/
1 Canoe/Kayak Trailer
Hardshell Kayak Sail Rigs
The Kayak Wing
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