Mm... I can't remember what it's like to be 6 years old (maybe they're too young still?), but these days there are a lot of light-programming-inside-games that they can do, like Fortnite Creative Mode or Roblox or Lego Worlds or of course Minecraft. Most of those games they can start off just playing (with supervision, if needed) and then eventually make stuff in later on, only if they like it.
And there's also visual programming stuff like Scratch, which targets kids. I dunno, those just sound more fun than Logo or MS Word, lol.
Also, an iPad or Fire for Kids might be another thing to consider... there are a lot of kid apps and it's less maintenance than a real computer and more parent-lock-downable, I think.