I'm not sure if I'm too late on this reply but here is my method for reference (if interested). I never bring buyers into my barn. I bring out the rabbits that I am selling and they are the ONLY ones they see. If they ask specifically to see the parents I will bring them out one at a time but...
I am curious how we have concluded that the "brown" baby is the same color as the mom? Based on phenotype it is obviously a different color. Mom has blue undercolor and silver tips, baby has black undercolor and golden tips. How is that the same?