I don’t know Khan, but really - I wouldn’t buy a curriculum if I were you. You want to teach your child how to read, right? ANY book will do - read to him. They don’t need phonics workbooks. You want to teach him math? Get one of those Spectrum Math workbooks and help him through it. You know more than any six year old. You want to teach him about science? Mix stuff in the kitchen. Get a blister microscope that you can look at bugs and bread with. You want to teach him about animals? Go to the zoo. It is really that easy. Make a list of what is really important and teach him. And have a great time. You can homeschool very cheaply - we did.
That’s what I’m doing. But, I feel like I’m selling him short, like something is missing. Of course, I went to very structured schools, so maybe it’s just my background and I’m trying to be too rigid.