My mom just sent me a picture of my best friend from school. The picture is of my friend, his wife and their 5 kids. The wife has black hair, and my friend and his 4 daughters all have practically identically-colored brown hair. And my friend is holding his son who has blond hair.
I'm certain his wife had an affair. No one in my friend's family has blond hair - all brown and black. And his wife's family all have black hair. I know, DNA, recessive genes and what not.
I also know I saw my friend's wife kissing another man at a Krispy Kreme in the mid-2000s shortly after she married my friend. That probably wasn't the right thing for her to do. But she also told me she was pretty sure I was gay well before I was out to anyone, and she wanted me to know she didn't care and just wanted to be friends. So I like her, bastard baby and all.
Still, that family picture makes me laugh.