Luigi's Confession

Luigi: "Father, I think I have committed a big sin."

Priest: "Why, Luigi?"

Luigi: "I think I married my sister."

Priest: "No, no Luigi. I've known you and your wife all your lives, and there is no relation. What makes you think you've married your sister?"

Luigi: "Last night -- we undressed for bed -- she looked at me -- she said ---"Oh, brother!"

Oh, brother!