Just when it seemed like there was finally peace between Wiz Khalifa and Amber Rose, a new lawsuit shows that there are still raw feelings between the former celebrity couple and their families.

According to the Washington Observer-Reporter, Katie Wimbush-Polk (a.k.a. Wiz Khalifa's mom) has filed a lawsuit against Amber Rose (a.k.a. his ex-wife) where she accused Rose of defamation after an alleged profanity-laced phone call that took place on June 19. Wimbush-Polk claims that Rose accused her of being an unfit grandma, and stated that Wimbush-Polk was responsible for the death of Khalifa's sister, Dorien "Lala" Thomaz, who passed away in February as a result of complications from lymphoma:

The call reportedly took place after Wimbush-Polk reported Rose to California Child Welfare Services. Wiz's mom denies ever placing that call, and there were no consequences of note when the service visited Rose (also on June 19). The lawsuit was filed exactly two weeks afterward, on July 3.

According to the paper, the suit is claiming that Rose's statements "[W]ere malicious, 'tended to harm' her reputation, lowered her in the estimation of the community or deterred others from associating or dealing with her." Wimbush-Polk also says that the charge that she allowed Dorien Thomaz to die caused her severe mental anguish and humiliation.

As for what she's seeking to gain from her lawsuit, Wimbush-Polk is suing for more than $50,000, which would cover court costs, interest, and punitive and other damages.