Oh, gosh, sorry, everyone! I forgot that not everyone was present and accounted for during the plottings!
Here's the deal: it is public knowledge that Jana had joined the military under the name of her brother, Reagan Treyburn. When Darryn found out and sent his men to have her arrested, she accidentally killed one the men and fled.
Redly was taken into custody for harboring her and in aiding her in posing as a man. At the trial that followed, he testified that it was an elaborate scheme to protect their cowardly brother, Reagan, who had fled to Serendipity rather than take his place in the military. Braxton confirmed that Reagan had, indeed, fled but could claim not to know about Jana's role due to being part of a separate unit. Redly did end up doing a little bit of military jail time for his role in helping Jana escape custody, in fact! He was also disowned by his parents and Brax became the next heir.
Whew.
Of course, the real story is a little different. In T14, Jana's twin brother, Reagan, was accidentally killed. (If I remember right, I think Pa shoved him and he fell wrong.) Darryn and Rose decided not to make the death public, although mention of Reagan's name was forbidden in the house itself. (In T14, the kids were the following ages: Redly 14; Reagan & Jane 12; Braxton 9; Dahlia 4; Trevian just born.)
In T18, Jana joined the military to escape her parents and an unwanted marriage they were trying to force her into.
In T23, the whole plan fell apart when Darryn discovered that Reagan Treyburn had enlisted. He sent his men to arrest her, she lashed out when it appeared they were going to kill Redly for trying to protect her, and then she ran. Darryn and Rose made it clear to Redly that if he didn't lie about Reagan's whereabouts, he would never, ever see any of the kids again...and had Braxton not agreed to tell the same story, he would have gone on trial and probably been disowned too. (Ages: Redly 23; Jana 21; Braxton 18; Dahlia 13; Trevian 9; Oscar 6; Jillian 4; Florry 2)
Obviously, Darryn and Rose would not have brought the story home with them in full detail to the kids, but the older ones would have known about Redly being disowned and kicked off the property, etc. I was assuming Trev knew because he can't resist the temptation to ferret out secrets... Now, he wouldn't have just spilled the beans to everyone, but he definitely knows. Cherie knows about the story and just assumes Reagan is out there somewhere.
I leave it up to the rest of you (and Zee) to decide what your character knows and what they don't. Does that make sense?