My mom is colorblind too. She sees colors differently. She never knew that until I told her two years ago, because she said my purple sweater was blue and I was like "nooooooooooooooooooo mom! You can't recognize colors! How were you a graphic designer for so long?" She was really upset by it, no one ever told her she was colorblind!
I always thought her use of colors in her work was sort of weird, but thought it was like.. designer's aesthetics or something lol No, colorblindness instead.
62 years of no one ever telling her: Hey, I think you don't see colors like the rest of us
edit to add that I didn't know, or I would've told her sooner.