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Brother/Sister breedings can really doom your breeding lines. When breeders are desperate to hang onto a trait that showed up in a batch of chicks, one that's rare and not going to be found from another source, then they will try breeding full siblings to replicate and hang onto the trait, but often the first generations of these birds are full of weak babies and genetic faults and the goal is always to get that first desired trait bred out and into a different, unrelated line of birds as soon as possible. It's a pretty rare circumstance that would favor brother/sister pairings. Go for a good, healthy start on your breeding program - you will thank yourself later on!!