Eye/Hair color - human genetics?

My family runs the gamut of eye/hair color. I would like to know how this happened and how common/unusual the results are.

Me - female/brown hair and eyes/olive skin tone/straight hair

Husband - male/red hair and green eyes/very fair skin tone/straight hair

Son #1(18) - Used to have blonde hair now has brown hair/blue eyes/very wavy hair/medium skin tone

Son #2 (15) - Very blonde hair/blue eyes/straight hair/light skin tone

We don't particularly look like each other. And yes, they are our biological children.

Eye/Hair color - human genetics?

The hair of baby blonds often darkens

They are temporary blonds

Eye/Hair color - human genetics?

It's mostly from time both of your children will have brown hair.. and as for the eyes...i have no idea, i had greed eyes from no where till 2 and now i have brown