Fundamentally, there is nothing wrong with keeping, breeding or selling hybrids, at least of commercially known strains. By this, I suggest the OB Peacock, OB fryeri, Eureka Peacocks etc...
The problem that I have, is when people breed these fish with normal strains... such as an albino fryeri, to a regular fryeri. Let's suppose they are all normal looking, and someone sells them to the stores.. well they are hybrid fry, but who is to know? Hybrids are part of the hobby, and there will likely be more Ornamentalization than less as time goes by, but please ensure that these Hybrid strains are kept "pure", in that they only breed with themselves, as opposed to the actual pure fish.
That is where I have issue with albino siblings, more than a likely hybrid albino specimen itself. The albino sibling is never going to be questioned, while the albino itself cannot be mistaken for anything but what it is.