My nephew stole a friends gun with the intent to commit suicide un benost to his friend. He is going to trial. First time offense. We r getting him he

He should already have an attorney for this serious of a charge.  The reason I would refer you to that person to answer your question is that person has discovery,  Discovery is all the Commonwealth's evidence.  They know vastly more about what to expect at trial.  The purpose for which he wished to use the stolen gun is not especially relevant to the fact that he took it without permission. However, it is strong mitigating evidence for sentencing.  SIt down with his lawyer and ask for a realistic expectation.  He may have defenses you are unaware of that the attorney is working on.