Plot: The 56-year-old CNN host and longtime “60 Minutes” contributor returned to the Stern Show to shine a light on topics ranging from his unconventional upbringing as the great-great-great-grandson of business magnate Cornelius Vanderbilt to the converted firehouse where he and his ex-boyfriend cohabitate and co-parent their two children. Cooper also clued listeners in on the state of his oft-scrutinized network and some of the many projects he has in the works, from the next season of his podcast “All There Is” to his latest biography about an ultra-wealthy family, “Astor: The Rise and Fall of an American Fortune