In a new interview on Piers Morgan's ITV show Life Stories, Jenner said that family members were given copies of her tension-causing memoir, The Secrets of My Life, before it was released in the spring, with the exception of "the last few pages when I talked about gender confirmation [surgery]".
On whether her gender transition was the business of her ex-wife and the family, she said: "No, it's not that big a deal".
Caitlyn not only made a decision to let the Kardashians find out about her sex reassignment surgery when her book came out because she wanted to keep it completely private, but also because she didn't trust them to keep the information to themselves.
"It's part of my life, and a very serious part of my life", she said, as if trying to teach a three-year-old why they shouldn't bite the other children. "I had already been living as Caitlyn for a year and a half, nobody knows anything".
"I didn't want them to leak it to the press", she added.
As well as opening up about the one word she said to Kim Kardashian in 2017, Caitlyn spoke candidly on Piers Morgan's Life Stories about her turbulent relationship with ex-wife Kris Jenner, and the Kardashian siblings.
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"Despite transitioning over two years ago, the "I Am Cait" star feels there is still a part of her old self within her".
Surely, most people would know to be sensitive when asking a transgendered person about their body and how they've transitioned.
She's right, of course - more trans people died last year in the USA than any other year on record.
As he smirked and asked why he "couldn't make a joke" about it, Caitlyn responded: "Because it's not amusing". Piers then asked once more for clarification - "So you sent her the entire book?" "And I want to see if I can make a difference". To be honest, I don't talk to them anymore.
The 68-year-old former Olympian posted an adorable snap to Instagram of the pair at a horse stable, captioning: 'My girl loves her horses!'
"I spent 23 years of my life carpooling those kids around, raising them, taking care of them".