The 27-year-old, who married Goody one month before her death from cervical cancer in March 2009, is said to have outraged the reality star's loved ones with his plans to expose details of their romance.
Speaking to the Sunday Mirror, Jackiey Budden, the Big Brother legend's mother, blasted her former son-in-law for attempting to make money from the tragedy.
"I'm absolutely stunned that he's doing this. I can't believe it," she said. "Jack can be so stupid sometimes. We're still grieving and he's making cash off the back of it by writing a book."
Sources close to Tweed claim that the book will focus on his first meeting with Goody in 2005, when she was still with ex-partner Jeff Brazier, and detail the various affairs he embarked upon throughout their relationship.
Tweed was first approached to pen a book about Goody mere days after her passing.