According to Radar Online, Tristan's father, Trevor, told them that he wants to write a tell-all book about his son's scandalous behavior AND reveal some secrets about the Kardashians, which would be both "really good and sad."
He said that he wasn't surprised about his son cheating on Khloe...even while she was pregnant. He also said that he has a "BIG BIG story" about what really happened with the two.
He also claims that Tristan wouldn't be in this situation if he would just repair their relationship and talk to him. After a statement like that, it seems that Tristan's father, IF he actually does come out with this tell-all book, would be doing to get even with his son for not wanting him around...out of hurt and bitterness.
I definitely pray that Trevor, Tristan's father, does not go through with this. Even though I know that people love drama, and would love to know what information he is holding onto. It is just so wrong on every existent and non-existent level for a father to do something like that to their own child.