Nothing Left Unsaid, a documentary featuring Anderson Cooper and his mother Gloria Vanderbilt in a series of candid conversations about themselves, their family, and the relationship between mother and son, airs tonight at 9 on HBO.
Watch the trailer:

RELATED: Gloria Vanderbilt Shocks Anderson Cooper With News of Her Lesbian Affair: WATCH
The book coincides with the release of a book, The Rainbow Comes and Goes, on the same topic.
Cooper and Vanderbilt sat down with CBS Sunday Morning earlier this week to discuss their project.
Among the things discussed in the sit-down were Gloria Vanderbilt's lesbian affair, and Anderson's hesitation to tell his mother that he was gay.
Said Vanderbilt:
“I had never heard the world lesbian and I didn't know what it meant. I became terrified that I would too become like that because it was then considered something that was a sin and a crime and something that was very terrible.”
Said Cooper:
“I came out in high school to my friends. Part of it in the back of my mind was that I head heard that my grandmother had been accused of being a lesbian and I ‘d known that as a child it had affected my mom. But I also knew deep down that my mom would be fine with it because she had gay friends who were always in our house growing up.”
Watch a separate interview with CBS This Morning which aired late this week:

Disclosure: If you buy something through hyperlinks to supporting retailers, we may get a small commission on the sale. Thanks for your ongoing support of Towleroad and independent publishing.