Like her mother, Kantner has, over the years, struggled with alcoholism. She has been sober since about 1998. She contributed a section to the book Playing It Straight by David Dodd, alongside her mother and other recovering substance abusers, such as Dennis Hopper, Steven Tyler and Ozzy Osbourne. In 1999, she married a Los Angeles dentist, Jamie Azdair, although the couple divorced in 2006. While they were married, she preferred to be known by her married name of China Azdair. On 13 April 2011, Kantner married actor and Producer Seth Isler and, again taking her husband's name, now prefers to be known as China Isler.