Okay, so in "Flashback" it revealed that Francis was born in the middle of Hal and Lois's wedding. Wouldn't that make his birthday on their anniversary or no? It kept me wondering because Lois and Hal's anniversary was celebrated in the episodes "Red Dress" and "Dewey's Dog" while Francis celebrated his birthday in "The Bully" and "No Motorcycles". Of course, Hal and Lois could have gotten married on another day..