Logo. It's the gold-standard of introductory programming languages. It has also been described as "lisp without the parenthesis", so it should have many of th

Logo. It's the gold-standard of introductory programming languages. It has also been described as "lisp without the parenthesis", so it should have many of the lisp fans on here on board. Finally, it's just fun. I have fond memories of moving that little turtle around with simple commands like "FORWARD 100" and "RIGHT 90", when I was introduced to programming at around the same age as your nephew. You really couldn't ask for a better first language.