The brother of the Unabomber said he knew nothing, too...but was sending money to the bomber regularly.
Brother said he didn't realize his bro was the Unabomber until he read the Manuscript published by the media.
I believe he knew early on that his bro was the Unabomber and thought his bro was suicidal....and that's why he turned him in and that was the deal with LE....no death penalty.
Every place the bomber hit had to set off bells and whistles instantly in his brothers mind.
Relatives will lie.
Or live in DENIAL.