—-Red hair and brown eyes are uncommon because there is a low chance that the gene for brown eyes will recombine onto a chromosome with the gene for red hair, and in order for someone to have red hair and brown eyes, they would have to have two copies of the gene for red hair and at least one copy of a gene for brown hair.
So if you are like me I had red on both sides and brown eyes on 1 side I got both. My grandfather on 1 side was from Germany the other side was all reds and from Scottish & Irish decent. My dad has blue-green eyes with red hair. I had dark red hair and brown eyes, lots of freckles but with a very slight olive tone to my light skin.