Harry Potter never expected that being adopted by the Addams would help him be a better student at Hogwarts.

Morticia helped him with Herbology, Grandmama tutored him in Potions & all the fencing with Gomez was very helpful when using a wand . "It's all the the wrist, my boy."

And not one of them blinked an eye when they found out he could speak Parseltongue.