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If you really want to have your child learn Basic, why not simply refer them to one of the many free basic interpreters. You can work with your teacher to find one that's easy to use for your children - or you can look yourself.
http://www.thefreecountry.com/compilers/basic.shtml
The reality is that good old BASIC is free of charge to anyone who wants to download one of the many implementations available. There are versions that run on Windows, Mac, Linux, etc., so there's no excuse for not having one available for your children once you know they're available.