Here’s how the book explains Ben Solo’s reaction (via ComicBook.com):
The revelation felt like a betrayal. Ben, who took after Anakin Skywalker in his powerful Force abilities and hot-headed nature, was crushed by the realization that his parents and his uncle had known the truth for decades yet had not seen fit to share it with him. He was incredulous that he had been left to discover the ... fact along with what felt like everyone else in the known galaxy. And the fact that his family had kept such a dramatic piece of information hidden seemed to justify every dark impulse and feeling of paranoia he’d entertained in his young life.
Obi-Wan, Qui-Gon revelation
“Skywalker: A Family at War” — written by Kristin Baver — actually had another major revelation in it, too, as I wrote for the Deseret News. The book reportedly describes how Qui-Gon Jinn and Obi-Wan Kenobi communicated with each other.
- “Before he and Yoda had parted ways, the old Jedi revealed that Obi-Wan’s beloved master Qui-Gon Jinn had returned from the netherwold of the Force, manifesting his conscious mind even after death. It took 10 years, but eventually Obi-Wan was able to commune with his dearest friend, resurrected within the cosmic Force,” the book explains, according to a Reddit leak.
This could be a hint for what’s to come in the new “Obi-Wan Kenobi” series on Disney+, as the show takes place 10 years after “Revenge of the Sith.”