Khloé Kardashian is now a new mother, but her moment was arguably overshadowed by the widespread cheating controversy involving her boyfriend and father of her child, Tristan Thompson.

Now, with some time passing since the incident first became public knowledge, new reports show that her sister Kim is giving her an ultimatum that is sure to shake things up, one way or another.

According to Radar Online, Kim believes that the NBA star "is bad for the family brand" and wants her to choose: it's either him or the family.

The site reports that the mother of three is "desperately trying to persuade her sister" that she needs to kick her cheating baby daddy to the curb before the scandal affects their family brand to the point of no return.

A source revealed that "Kim has taken a tough love stance with Khloé regarding the issue and "made it clear" to the new mom "that if she lets Tristan back in her life, she's on her own!"

Kind of savage, no?

"Kim is disgusted that Khloé is even thinking about taking this man back," the insider continued. "She doesn't want to kick a sister when she's down but she's telling the family a certain toughness is necessary as it affects them all. This is bad for the brand and Kim doesn't appreciate how Tristan is dragging the Kardashian name through the mud."

This comes on the heels of Khloé giving birth to her and Thompson's baby girl on Thursday morning, April 12, in a Cleveland hospital. Both Kim and Tristan were reportedly in the delivery room with her at the time of the birth.