That's true about Dean maybe not telling Lisa but my feeling is that Lisa's the sort who would be all "EVERYBODY has a birthday..." and be all sneaky and found out - whether it was going through Dean's wallet and looking at his ID for clues or maybe even making Ben poke at Dean until Dean told the kid. But yes, it's my headcanon she knew and that she totally had pie and a gift. She wouldn't make it an all-out party but just the three of them with pie for dessert after dinner and having one hell of a yogic-sex session later, yeah, I can see it happening.

But poor Winchesters. Sucky Birthday Awards are not a happy thing to win. I've given up comparing who has it suckier. Both of their birthdays suck on different levels. Sam, though, might just edge out Dean if only because everyone dies on his birthday.