So you are saying that it would be common knowledge, at least inside the extended family, and therefore an original source for this "affair" information is therefore moot, even though there is no proof of any affair a year and a half ago other than KS saying there was, and MT specifically denied to People magazine that she had any knowledge of financial or marital problems:
http://www.people.com/article/texas-fitness-instructor-died-husband-speaks
5/10/2016 "
...In a separate phone interview on Tuesday, [MT], [BB]'s mother and [MB]'s mother-in-law, tells PEOPLE that the details about [MB]'s "flirtatious" messages "knocked us down a little bit."
[MT] says she wasn't aware the couple was having financial or marital problems. ..."
So KS knows about "marital problems" but according to MT;s own statement, MT does not. We cannot have it both ways. Either MT did know about marital problems or she did not know about marital problems. So that ends the theory that MB's affair was some kind of common family knowledge, because MT says she did not know. But KS knew, and she chose to say it on national television. I want to know WHO told her about MB having an affair - I want the
source.
Adding to this is MT's "tarnished memory" 7/7/16:
http://www.people.com/article/missy-bevers-investigation-slow-texas-fitness-allegedly
"
...As for her son's state of mind, [MT] says [BB] "has his good days and bad days," and that the [family] are staying busy. His [family] know a little bit about the rumors that [MB] had been unfaithful, but [MT] and the rest of the family are trying to shield them from that as much as possible.
"It's almost like having a tarnished memory," she says. "I hate that I have a tarnished memory, and I don't want them to have a tarnished memory."
It helps them to hear that their dad "loved her no matter what," [MT] adds. "Whatever happened in the past, he still loved her. ... "
Tarnished-Tarnished-Tarnished, let's emphasize Dirty-Dirty-Dirty because that is more meaningful than that the mother was murdered (!), and by giving a People interview emphasizing "tarnished memory" that is supposed to help shield the family, somehow. And let us not forget that MT has herself been divorced at least once (from RB) and has remarried herself, and produced children from both marriages, all of which in many Christian denominations is not acceptable. For example, a Catholic in such a position is not to partake in Communion because they would be considered "tarnished".