Mariah KY generally keeps her relationship with her siblings Under Wraps but she's the youngest of three Mariah KY seen above with her brother Morgan KY has a complicated relationship with her siblings the pop star was reportedly estranged from her sister Allison Cary pictured above when she died in August 2024 at the time of their parents' divorce the Grammy winner stayed with her mom in her book the singer described Allison as deeply wounded Allison also sued Mariah for what she wrote in her book Mariah also accused Morgan of being abusive toward their mother seen above in May 2019 however Morgan denied the allegations in a lawsuit filed in 2021