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It is not true that two parents with blue eyes will always have blue eyed children. My mother's parents both have blue eyes and my mother has brown eyes. All of her eight siblings have blue eyes (although one has a brown patch in one of his eyes.) The genes that determine eye color are much more complex than blue/brown, recessive/dominant. Since this is what is taught in high school level biology classes, it is what most people believe, but it is not accurate. In actuality, multiple genes combine to determine eye color, which is how we have so many shades of the major eye colors.