Grampa vs. Sexual Inadequacy Which of these screenshots is from "Grampa vs. Sexual Inadequacy"?
Grampa vs. Sexual Inadequacy (S06E10)
When Homer and Marge's marriage declines due to their fading sex life, Grampa pieces together a tonic that is guaranteed to put the spark back into their relationship. The effectiveness of the tonic results in Homer and Grampa going into business together, selling "Simpson and Son's Revitalizing Tonic" to the public utilizing a medicine show. They travel from town to town selling the product, but after visiting the farmhouse where Homer grew up, the two get into an argument. Grampa yells at Homer in the car, saying that if he had not taken the tonic years ago, Homer would not have been born. Homer then stops the car and abandons Grampa.
Later, Homer goes back to the farmhouse to think. He sees old photographs, including one of himself as a child on Christmas morning, where he thinks his father was not even there when he finally got to meet Santa Claus. Homer then realizes that it was really his father in a Santa costume, proving that Grampa did actually care for him. Homer quickly reunites with Grampa, who by coincidence has also gone to the farmhouse to reflect. They both admit they are screw-ups ? since they both caused separate fires in the farmhouse ? and they finally reconcile.