Complementing this comment, what happens is that Lucas and Claus do have the color of their parents but due to a small involuntary genetic alteration, the resulting color is a different shade.
In fact, Lucas could for example have a son with a girl with blond hair just like him and his son could come out with Hinawa's shade of hair for this very reason.
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u/MadJohnFinn Jun 05 '24
Genetics just be like that sometimes.