A couple have 13 children, 12 of them are blonde and have blue eyes, 1 has black hair and brown eyes, his name is Peter. One day the woman of the couple is dying of illness, her husband is sitting on her bed.
The husband says “Our Peter is different from the other kids, does he have a different father?”
His wife says yes.
And, the man says, “Then, who is his dad?”
Upon which his wife says, “You”.