While click and clack are brothers and look somewhat alike, they have only about 50 percent of their genes in common. this would mean that click and clack are most likely twins.

Fraternal Twins

Explanation:

According to my research on studies conducted by various scientists specializing in genetics, I can say that based on the information provided within the question Click and Clack are most likely Fraternal Twins. These are twins that are born on the same time but since they are from different eggs they only share a certain percentage of the same genes. These type of twins can be either both of the same gender or one can be a female and the other male.

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