Breeding siblings is not a very good idea. There is less of a chance of pairing up undesirable genes if the two snakes are first cousins or less closely related. I'd replace one of those snakes with a red albino that someone else bred.
I'm not up on hoggie mutants and cannot predict the results of that particular mating.
touchy subject, but one instance of inbreeding should't have much or any affect from what I've read...no guarantees though!
Unless you know a lot about genetics and what will occur when mating siblings I wouldn't do it.