[luv-talk] Teaching children programming on mac

I would like to start teaching my children programming. They have access to an iMac, I am thinking that now they old enough to learn a language. I've looked at the standard Mac programming. But it seems to complex to start them off on. Any suggestions? By the way the children's ages are 9 (boy) and 13 (girl). They are home schooled it would be great to be able to add another subject under their belt. If necessary I could create a virtual machine with linux running in it. Thanks for any suggestions.