I don't think Donna will roll over on either of her children. If she's desperate to try and save Wendi, she might roll over on Charlie since he's screwed anyways.
Donna will try to stay quiet and plead the 5th.
If Charlie is feeling particularly vindictive, he might roll on Wendi. Depends on if he gets offered any prison perks, ie transfer to a nicer facility, conjugal visits, yard time, etc…maybe he’ll get to pull some rotten inmate teeth to keep his mind off the rest of the future.
Charlie will not roll over on Donna, but Wendi? I think there’s a chance. I think Charlie’s main motivation was gratifying Donna, now what’s he gonna do for Donna? Throw a “triple extortion” theory at the wall while on the stand and see if it sticks? Please.
Unless Donna stipulates they need to continue shielding Wendi, he may change his mind. How’s Harvey going to fair on his own without Donna? Maybe the old man will beg Charlie to flip on Wendi for the sake of his mother, even if it would be against Donna’s wishes.
Right now it’s too early to tell what the Adelsons are planning. I don’t think Charlie is above flipping on Wendi for his own benefit and for Donna’s. If someone has to sacrifice custody of the children to the Markels in the interest of saving Donna a sentence or two + prison perks, I doubt Charlie is above it.
Wendi could surprise all of us and flip on both her brother and her mother to save herself and Harvey if it comes down to prison time and losing custody. Donna and Charlie are screwed. I’m NAL but if I were Wendi’s I’d tell her to put herself first and accept that her mother and brother have sealed their fates. I’d tell her to prepare to negotiate with Jack and Georgia for more immunity/lesser charges/no charges at all for her and Harvey, in exchange for information on Donna. Work out shared custody with the Markels, and start talking.