I really don't know what to do for the best.......

[Lara2]

Really sensitive subject, so please bear with me as I can't give details. Basically, I have found out something about DNephew2 from his brother. DN2 has been accused of something serious and it's going court - both his brothers know, but he has refused to tell myself, DSis or DF. He's going through hell which breaks my heart.
My problem is, do I tell DSis what I know because she will eventually find out and know that I knew before her. This will obviously upset her. Or do I keep my counsel and deal with the fallout when it happens?
DN2 doesn't know that I know and I would never let him know. DN1 is so rubbish at keeping secrets and it came out by accident when we were discussing something else and I guessed.
WWYD???????

How old is he? And is he likely to go to prison for whatever he's gone?

I would do my very best to encourage DN1 to tell his mum.

He's in his early twenties - could possibly go to prison.
DN1 feels that he can't break DN2's confidence by telling DSis. He's going to try and persuade DN2 to tell us, but DN2 is just so frightened, panicked and embarrassed that he's adamant we can't know.

In your position I would act as though I didn't know and would tell my DN1 to forget he'd mentioned it. Much easier all round.

The problem is, even if I ask DN1 to never tell DSis he told me, he will promise and really mean it, but it will slip out and he will be gutted when it does. I think I will go along the the road of not knowing, but shit it's hard