How am I lighter than both of my parents?

Both of my parents are biracial. My mom is Mexican and Black but she looks like a full black woman with loose textured hair and she's about the same complexion as Gabrielle Union. My dad is Black and White but he isn't that light, he's around Barack Obama's complexion but he has Hazel eyes. Meanwhile, I'm this color.
How am I lighter than both of my parents?
I have more black in me than they do, so I'm kind of lost. I could be in the sun all day and I'm still lighter than both of them.
How am I lighter than both of my parents?
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