You might recall that law enforcement employees suggested to Brendan that he tell his mother the story they concocted.
Here's an example of Brendan 'confessing' to his mother:
Barb: Was your attorney there when Mark and those guys were?
Brendan: No
Barb: Don't talk to them no more
Brendan: Yeah
Barb: They are putting you in places where you're not.
Brendan: Yeah
Barb: You know the the reason they're talking to you is to get more information out of you and what your attorney should be doing is putting an order on all of them that they can not interfere with you or your family members unless your attorney is present.
Brendan: Yeah
Barb: Cause they're all investigators for the Halbach case.
Brendan: Yeah
Barb: Not the Dassey case, it's the Halbach case.
Brendan: Yeah
Barb: Cause the only thing that they're putting out there is bad stuff about you and if you weren't there at the time if you didn't slice her throat. You did not have sexual contact with her
Brendan: No
Barb: That's the reason that they're saying. Yeah, that's all in the report here that Mom's got.
Brendan: Yeah. So if I was in the garage cleaning up that stuff on the floor, how much time will I get though for that?
Barb: What was it?
Brendan: I don't know. It was this reddish-black stuff
Barb: See what they're probably going to do is turn around and have it that "Steven said this, Steven is saying you were here". If you say "Yeah" not meaning "Yeah it's true" just "Yeah", they're going to say OK, Brendan was there. Brendan did that. And then they're going by Steven and saying well Brendan said this and Brendan said that.
Brendan: But what does Steven say about it?
Barb: Steven just says that you're a "dumb ****".
Brendan: Yeah. Well last time I talked to Mark and that they said that Steven was trying pin me and Bobby for it.
Barb: Yeah, they come to our house wondering what Steven said, right over the phone, to Chuckie, mind you, that he going to set it up with his attorney that he blames it on me and Earl ·
Brendan: Yeah
Barb: And I looked at Mark and Tom and told them that well if he tries doing that he is going to be one sorry son-of-a-*****. Brendan: Yeah
Barb: I told them it is pretty pathetic he has to go "fricking" kill somebody and take an innocent kid down with him
Brendan: Yeah and plus if he didn't do it then why would was he trying to hide up north that one day
Barb: But see they got that on camera that you were sitting right across the table from Steven smiling at him.
Brendan: I had my head down
Barb: Yeah
Brendan: That's cause they said act normal.
Barb: Um-huh
Brendan: Yeah
Barb: It is normal, Brendan to sit down all the time. So did you see the body in the fire?
Brendan: No
Barb: Steven says that you seen the body in the fire
Brendan: No
Barb: You know if he killed her?
Brendan: Not that I know of
Barb: So then how do you know that there was a bullet shell outside of the garage
Brendan: Cause when Mike came up here he had pictures of it
Barb: They told everybody that you told them that there was bullet shells inside the garage
Brendan: No
Barb: That Steven shot her 10 times
Brendan: No. In the picture they had a bullet right by a crack or something cement
Barb: Uh. Don't believe those guys what they say.
Brendan: Yeah
Barb: You don't need to talk to them. It's just that on that Monday when they took you out of class at 10 o'clock. They said that they called me and asked me to talk to you. They never did.
Brendan: Yeah
Barb: They never called me on that Monday
IMO there is better reason to trust Brendan when he actually informs his mother in his own words of what the transcripts show - law enforcement employees fed him information, manipulated him with their lies, and threatened him into saying things that were not true.