The premise of the strip as a whole is that Dracula is usually depicted as an evil, murderous monster. But in "My Dad is Dracula" he is a loving and attentive father who likes conventionally dad-ish things (like bad jokes, gently teasing his son for not doing his chores, and grilling, etc).

Many of the strips feature specific jokes in the last two panels: In this case, Dad sounds like he's about to reveal something significant, or potentially upsetting. But in fact, he's just letting his son know where a health-recovery item is hidden in the game they're playing together.

It's gentle humor, more sweet that hilarious.