It's a small world. It turns out there's a heartbreaking connection between Martin Short's daughter, Katherine, who just passed away by suicide, and the late Rob Reiner's son Nick, who is in custody for allegedly killing his parents. According to the DailyMail.com on Wednesday, Katherine and Nick actually grew up as childhood friends in California. Their fathers were super good pals and actually lived pretty close to one another. The children reportedly grew up playing with each other on the weekends, a source shared: "Martin and Rob were very close.