Mackenzie Phillips is claiming in her new book, High on Arrival, that on the eve of her 1979 wedding she slept with her musician father, John Phillips. “My father was not a man with boundaries,” writes the actress, who is appearing on Oprah this afternoon. “He was full of love, and he was sick with drugs. I woke up that night from a blackout to find myself having sex with my own father.” Singer-songwriter Phillips was, of course, the founder of the Mamas and the Papas who enjoyed an extraordinary run of hits in the late ’60s, including “California Dreamin’,”...