This is going to sound odd, but I'd go for a used macbook pro. Apple has awesome parental controls, and you can set things up remotely. I also like the programm

This is going to sound odd, but I'd go for a used macbook pro. Apple has awesome parental controls, and you can set things up remotely. I also like the programming environment for my son (7). We started off with scratch a long time ago, now he's moved on to Java (following along with examples), and I even got him a MicroBit that he can program with the MS Scratch-like interface. It was an easy choice for me since I just upgraded to a smaller MB Air for travel, and well...I stepped on his raspberry pi (he loved tux math).