A old married couple have 13 children.
12 of them are blonde and have blue eyes, and 1 has black hair and brown eyes.His name is Peter.
One day the wife is dying of an illness.
Her husband come into her room and says:
“Our Peter is different from the other kids – does he have a different father?”
His wife replies,
“Yes.”
The man asks:
“Then, who is his dad?”
Upon which his wife says:
“You”.