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Note:

To be color blind you need 2 color blind allele. So color blind allele are recessive. In females, color blinds only occur if both of the alleles are recessive.

Cousins are of course biological cousin.

Genetic similarity defined as the partial derivative of expected value of having a color blind allele of a cousin as a function of the percentage of you having color blind allele is 1/8.

I think I should add that color blind alleles are extremely rare. It's actually 5% but you can presume it's .0000001%. However, you, a female, is color blind. What's the chance that your cousin is color blind?

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    Yap. I think I did that. It's good enough now.2012-06-11

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Suppose that no one ever comes to Grey City, no one ever leaves, and every male is colour-blind. Then the probability that a male cousin of a colour-blind person is colour blind is $1$.

The point is that one would need a great deal of additional information, and make additional simplifying assumptions, to answer the question for, say, Canada.

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    Still not enough information to make it a math problem. Do people mate randomly for example, or are color-blind people extra likely to seek out a color-blind mate?2012-06-11