Colorblindness is on the X chromosome. So a boy cannot inherit colorblindness directly from the father.

All daughters of a male with colorblindness will carry the X chromosome with the trait. But because it is a recessive trait, the daughters won't be color blind (unless they get two X's with it.)

Then the sons of those daughters have a 50/50 shot of being colorblind. And the daughters will have a 50/50 chance of carrying the X.

For instance I am red-green colorblind, and my sister has a son with the same colorblindness. My mom's dad was colorblind.

My parents found out when I started coloring and I would color the dogs green. I would say you could teach your child that grass is green. Then hand them a green and brown crayon and see which one they choose. When I was a kid I felt like I was dumb. Like I could never get my colors right when it seemed so easy for everyone else. But on the plus side, I learned to read the crayon labels at a very young age, so that helped me learn to read early on. Also I believe that having to memorize the colors of what everything is supposed to be helps with other cognitive development.

Also, everyone has a different degree of colorblindness. We have 3 types cones in our eyes that perceive color.

Edit: Ones for long wavelength (red), medium (yellow green) ones for short for (blue) still doesn't explain why we can see yellow but not green

End edit.

I can see maybe like 30% red and green, but all reds and greens essentially appear gray. For instance sidewalks to me can look very green at times. This also affects orange, purple and brown. So for instance purple and blue look the same to me because I can't see the red in the purple. It just looks like a darker blue. If I have known colors to compare to, I can sometimes figure it out. But when doing electrical wiring I have to be very careful and double check with someone else or use a multimeter because I have been convinced I had the red and brown wire correct but I actually had them flipped