Who can forget that totally worthless Monica L. "book," then Amber came with a literary tome - NOT, and Scott Peterson's sister's redundant musings, etc.
I don't think any family plans for this kind of thing. But too many are willing to exploit it if it falls into their hands. That is more than likely the case here. You would think that they would go talk to him to get an idea whether he is guilty or not before making public statements.