Parents have black hair, son has a dark blonde hair?

Question

How come?

Answer

Their might be a grandparent in the family or someone who has light hair. Genes

Answer

Recessive genes. 
My BIL had blonde hair as a kid that turned dark brown over time. My sister has almost black hair. Their kids both are blonde hair, blue eyed. As the kids have gotten older, their hair has gradually began to turn brown.

Answer

Genetics are so cool. I have dark brown hair and brown eyes. My SO has dirty blonde hair and hazel eyes. Our son has strawberry blonde hair and blue eyes. My moms hair is strawberry blonde and my SOs dad has blue eyes. Brown hair and brown eyes should be dominant over the recessive traits but we made one handsome baby boy 😁

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My husband daughter and myself are all brown eyed brunettes and all tan easily that lasts for months then there is my snow white gingery son.

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My husband and I both had blonde hair when we were young but have brown hair now. Our son has blonde hair. It is slowly getting darker so I suspect it will be brown as an adult too.

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My parents are both Latinx with darker features. My brother was born with green eyes and blonde hair. He looks exactly like my dad except for his coloring. I'm sure it's from the European ancestry somewhere down the line. Genetics are weird sometimes.

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My husband and I both have dark brown hair but was born with blonde hair and it turned brown. Our daughter is blonde.

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Genetics are wild. Both my husband and I have dark brown hair, and our first kid has blond hair and our second has a reddish color.