A Tough Concept

(I’m at a barbecue with several family members. I’m talking to my younger sister. She’s guessed that I’m pregnant.)

Me: “Yeah, so I’m due on [day before her birthday], so happy birthday!”

Sister: “Oh man, that means you and [Husband] had “Happy Birthday, Dad” sex!”

Me: “What?”

Sister: “I figured it out, and Mom and Dad must have had sex on his birthday, so that means that’s when you guys did it, too!”

(I assured her that wasn’t how we celebrated our dad’s birthday, but decided that correcting her about the conception date was a little TMI.)