Kim Kardashian has her famous rapper husband. But the 35-year old doesn't want her 17-year old half-sister Kylie Jenner to have a (less) famous rapper boyfriend.

According to Radar Online, Kardashian is trying to break up Kylie and Tyga in part because T-Raww is the father of Kim's "best friend" Blac Chyna’s son.

Kylie lashed back at her big sis's efforts to end her relationship by questioning Kim's relationship with Kanye.

"[Kylie] also told [Kim] that at least she is with someone because she has feelings for them and not because they will make her more famous,” Radar's insider says. "That really hurt Kim."

Tyga and Kylie have kept their relationship (relatively) low profile. But once Kylie turns 18 and gets legal, Radar's source believes they will "come out" as a couple, further infuriating Kim.

Next step, Keeping Up With the Kardashians spin off.