Python is one of the most popular programming languages around. There are already plenty of robots and educational kits that can teach kids the basics of coding at a pace they are comfortable with. The JuiceMind Python Programmable Smart Doorbell kit is also worth a look. It comes with everything your kids would need to put together a smart doorbell that sends a text when pressed.
Online interactive tutorials are available for it. By completing this project, students learn about data types, variables, operators, and functions.