Depends on how low level. I started with qbasic and gives good logic and basic ui.Then obviously c. I think incomplete coder without that.C# is easy after that. To get grasp of oo.
Thanks Gunjan. C is good but difficulty level is high for class 5 / 6 level kids.
I would let them start with Python, because of it's ease of use and relevance in the current technology space...
Thanks Amitabh. I agree with you. Python is also functional and hence easy to comprehend.