Jack Harlow is good at a lot of things, but knowing famous R&B lineage is not one of them.

Fresh off the release of his sophomore album, Come Home The Kids Miss You, Harlow was on Ebro in the Morning when he revealed that he did not know Brandy and Ray J were siblings.

“Who’s Ray J’s sister?” Harlow perplexingly asked while listening to Brandy’s track “Angel in Disguise.” The rapper was playing a game with Ebro in the Morning called “White People Ish” where the guest gets quizzed on music that they might not have heard a lot when they were growing up. After going through a gauntlet of old school rock and R&B tracks, many of which stumped him, it was this answer towards the end of the segment that was truly hilarious.

“Brandy and Ray J are siblings? Nobody has ever told me that in my life,” Harlow said with a laugh. “Y’all got a good clip out of that one.”

Harlow’s lack of knowledge about classic R&B aside, the Louisville rapper utilizes a lot of it in his latest album. The project opens with a Destiny’s Child sample, and throughout the album, Pharrell’s touch and Drake’s influence can be heard. Come Home The Kids Miss You is slated to have a big first week and also featured appearances from Justin Timberlake and Lil Wayne.

Watch the hilarious clip from Harlow’s visit on Ebro in the Morning up top.