Sorry, if they told you that they have to mix several breeds to get calicos, they're lying or extremely ignorant. That's basic genetics. Calico is an extremely common coat pattern, because, again, all you need is one dark cat and one red cat with high white. I don't like it when breeders make inaccurate claims like that.They’ve been breeding the cats for a while and no offense but I’ll probably stick with their word about the calico breeding