The Kardashians continue to prove they aren’t quite the Brady Bunch. On Sunday night’s episode of Keeping Up With the Kardashians, a family secret was revealed involving Kim Kardashian and her step-brothers, Bruce’s sons Brody and Brandon Jenner. In a clip visible on E! Online’s website, Brody reveals his older brother and step-sister once shared a kiss.

In the scene, Brody, Brandon, and Brandon’s wife Leah are having lunch while on their vacation yacht in Thailand with Kris Jenner. Brody complains about walking in on 33-year-old Kim while she was taking selfies and Kris accuses him of having a crush on his step-sister.

“I think you have had a crush since you were like seven years old.”

Brody is quick to defend himself, pointing at his brother and saying, “That was him and Kim, you are forgetting that.” He then announces that the two had once kissed “back in the day.” Kris and Leah both burst into shocked laughter and Kris asks her stepson, “What?!… You kissed Kim?” Brandon is seen blushing and can be heard repeating, “It’s not true,” even as his brother exclaims, “It’s on you now, you know it’s true!”

Kim was not present for the conversation and has not publicly commented on the clip. The show continues to air on E! on Sunday nights.