Colorblindness

For the past year or so, I've thought that Colton might be colorblind. I didn't really really think he was, because we have no family history that I'm aware of, and it's a genetic defect, so there HAS to be someone in my family history with it, in order for Colton to be colorblind. When I took Colton to his 3 year well child appointment, his doctor was shocked that he doesn't know ANY colors. She said, for a child as verbal as C to not know his colors is odd. Then she asked if there was a chance he could be colorblind. I told her I didn't know. So we did a colorblind test on him, and he failed. For those of you who don't know what a colorblind test consists of, go to www.colorvision.com and it will show you. It's not naming colors or matching colors. Its being able to see objects within colors. Mosaic looking kinda. Anyway, so since he failed that, I continued to keep an eye on him, and then decided to take him to a pediatric eye doctor. They did a different colorblind test on him a he failed that one also. I'm still having a hard time believing it though. I'm wondering, well, maybe he didn't understand the test? If you want to understand the genetics of colorblindness, you can google it, but we did the test on my grandfather, and he passed, and will do it on my dad too, as soon as he gets back into town! Usually, with the way it works, either the child's grandfather or g -grandfather is colorblind. Anybody else know much about colorblindness (or so I've learned the correct term color deficiency---because they see color, they just see the colors wrong...) I might just have to wait it out, and just keep an eye on him. It's frustrating though, because I don't know if I should be trying to teach him his colors (if he's not colorblind), but if he is colorblind, that's almost like trying to teach a deaf person to hear.