I'm not an expert on genetics, so I'm a little confused on your last post. I thought it was quite possible for a child to have the eye color of one parent and the hair color of another parent. Not trying to contradict what you said, I'm simply curious.
Well, it is possible, definitely. I’m not an expert either, though I did some DNA centered biology in high school… What I know about eye and hair color is that a lot of genes play a part in them, so you can for example have two parents with brown eyes have a child with blue eyes, if the necessary genes exist in their DNA. I guess that similarly, the possibility of not only one but two children inheriting the exact genes necessary to have each other parent’s colours is extremely slim.
In any case, my problem is that so many people do it in fics and stories it’s ridiculous. Even Suzanne Collins did it in The Hunger Games and I was like 😒