i'm not sure what you mean by the bolded. nero knew that juice killed the girl, and that jax is the one who gave him the orders. he spilled the beans when he was but naked and flying high as a kite.
Right, but initially it was a secret - Jax had promised Nero he wouldn't kill the mom, but had Juice do it anyway. I think Jax and Juice were the only two that knew he actually had her killed... I don't think the rest of the club knew (and maybe still don't)?
So, in order of events...
1. Juice steals the coke, kills the member, etc. all because he thinks the gang will kick him out 'cause he's half black (cops wanted to get leverage on a member to help w/ RICO case).
2. Jax eventually finds out, "pardons" Juice in exchange for his complete unquestioning loyalty.
3. Jax uses Juice to do the dirty work on the mom (not to mention the assists in taking down Clay, etc).
4. Juice eventually cracks after failed suicide attempt #2 and "betrays" Jax by telling Nero about murdering the mom.
5. Jax let's Juice know that he knows about him telling Nero, which puts Juice in desperation mode once again.
6. Juice is thinking of going on the run or whatever anyway when stumbles upon Tara's murder.
7. He saves Gemma's hide, they make up the story, Gemma helps Juice hide.
8. Shit completely hits the fan. Juice is caught in the act trying to rat out the club (to save his own ass, again) to the Mayans. He gets his one last shot at supposed redemption - tasked with offing Lin in prison.
9. Offs Lin, but in the meantime Jax uncovers the truth, so now there's nowhere left to go.
Did I get all that right? There's no way you leave Juice alive.
To answer the question would I have wanted to tell Jax about his mom killing Tara? Of course not. But would I have lied and covered it up - no way. I would have honestly tried to talk to other club members... Bobby, Chibs...
But that's the point with Juice. He's an idiot.