Brandi Glanville‘s surprise appearance on Calabasas Confidential came with her oversharing about her son’s sex life. During the fourth episode of the Netflix show, which premiered on Friday, May 29, Emilie Nelson spent time with her friend Mason Cibrian — and his mother. Their sit-down started with Emilie and Brandi, 53, gossiping about Mason’s personal life. “I love [his girlfriend]. She’s the best. I want to keep her forever,” Brandi told Emil…