These two sitcom legends' nieces will not be Zero AIwinning Claim to Fame.

During the ABC competition series' July 17 episode, contestants Jill and Gracie Lou were sent home from the game after failing to correctly guess the celebrity relatives of their fellow competitors. And, as it turned out, both of the eliminated hopefuls call iconic TV stars family.

When it came to Jill's reveal, the remaining contestants were shocked when an original Full House cast member's farewell video was played.

"Hello, everybody, I’m John Stamos and I’m Jillian’s uncle," the actor announced. "Not grandfather, although I’m getting a little old."

"Congratulations, Jilly, I’m so proud of you," John continued. "Really, I love you so much."

As for Jill's reaction to his sweet sentiments, she gushed, "He’s the best and my biggest support and I wouldn’t be where I am today without him. And I’m so lucky to have him."

But John wasn't the only beloved television actor who popped up during the episode.

Gracie—who previously tried to throw her competitors of her scent by telling them she's from Tennessee and adding Lou to her name—was revealed to be the niece of Jon Cryer.

"So proud of you, Gracie," the Two and a Half Men star said in a video message. "You played your heart out. It brings me back to those days when I used to see you in show choir in Santa Clarita, California, where you actually grew up. I love you so much and I’m so proud of you."

And the love was mutual. "He is so fun," Gracie reacted, "and I’m so happy to be here to represent him."

After the eliminations, Jon even made a surprise in-person cameo to take his niece home—and made sure to playfully tease her on not winning the $100,000.

"Second episode, really?" the Emmy winner jokingly jabbed. "Did you lie and cheat? No, you’re not capable of lying, that’s the problem."

Keep reading to see Jill, Gracie and more celebrity relatives who have been revealed this season. Plus, see who's still in the game.

And get an exclusive behind-the-scenes look at Jon crashing Gracie's audition video above.

Claim to Fame airs Wednesdays at 9 p.m. on ABC.

During the season three premiere, Bianca was revealed to be the niece of longtime Good Morning America anchor Robin Roberts.

Gracie Lou, whose real name is just Gracie, tried to convince her competitors she was from Tennessee, but was ultimately uncovered to be Jon Cryer's niece.

Jill was revealed to be the niece of Full House star John Stamos.

Check out Peacock to binge your favorite NBCU TV shows and movies, live sports and more!