Board Thread:Speculation House/@comment-3257939-20131111020445/@comment-16502426-20131117045626

I'm not sure that there's an issue genetically. If I'm remembering my biology class correctly, each parent carries two genes for each trait, so there can technically be up to three visual variations of any gene in a given group of siblings, and these siblings can be any combination of variations.

Further, hair color actually involves multiple genes. IIRC, the gene for redheadedness is separate from the gene for other hair colors. So Ruby would have the black hair color gene in addition to a redheaded gene.

So if parent 1 has: NO RED/red, BLACK/blonde

And Parent 2 has: red/red, BROWN/blonde

Then we could easily have Yang and Ruby. We could also get strawberry blonde, auburn, brown, or black.

Please correct me if I'm off on any particulars of genetics, but the basis of this post is that it is certainly possible for Ruby and Yang to have the same parents.