Savannah and Chase Chrisley are almost grown up on the newest season of USA hit series Chrisley Knows Best, but they show viewers in tonight’s episode of the show that they’re never too old for revenge on their dad, Todd Chrisley.

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In a special sneak peek, Savannah and Chase think the best way to celebrate a new year for Todd, is to get him back for how he brought in Chase’s birthday.

“This is the perfect time to prank him…Last year for my birthday, my dad decided to turn our house into a hotel. Now I’m getting my payback.”

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He recalls when Todd went as far as dressing up as a hotel bellhop and handing him a bill for $325 for all of the services he did for Chase.

He sparks up a plan with Savannah to make him think that he’s getting way older than he really is.

“I’m gonna make him think he’s shutting down” and “driving him crazy every chance he gets. By the time he turns 48, he’s gonna feel like he’s 84.”

Savannah points out, “You’re evil.”

He then calls Todd and talks quietly on the phone so he can barely hear. Savannah joins in and does the same. Todd is clearly annoyed but keeps asking, “What?! Say it again. I don’t know what you’re saying.”

Todd realizes it is a prank when Chase tells him, “You need a hearing aid.”

Don’t miss the full episode to see what else Chase and Savannah do to get under their father’s skin. Chrisley Knows Best airs Tuesdays at 10/9c on USA.

Tags: Chrisley Knows Best usa Reality TV