Legal Question in Criminal Law in California

He's looking at grand theft and receiving stolen property. Yes, they carry a very realistic possibility of jail time, even as a first offense. Both charges are "wobblers" and can be charged/resolved either as felonies or misdemeanors. He absolutely needs an attorney.

It is one of those questions that is impossible to answer. One thing you did not say is how old is your son. In any case the first step is getting a good attorney.