First, listen to your attorney and don't solicit a whole lot of advice from laypeople who may or may not be right. That having been said I do want to give you some encouraging advice.
You have two main issues:
1. What to do about your criminal charges.
2. What to do to safeguard your child.
Apparently your attorney isn't very hopeful about winning an acquittal because you are focusing on how much a jury might give you. If we are talking about a single, relatively minor incident and not a broad based scheme to steal identities I would agree that any active 10 year sentence is highly unlikely.
Don't worry too much about what the DA will or won't recommend. That's kind of like asking a teenager to make a recommendation on what to do for the weekend. They are going to make a recommendation that is way in their favor (as much as they can get) and their recommendation doesn't carry that much ACTUAL weight. When it gets right down to sentencing its going to be the facts of the guilt that make the difference. If you hurt someone, or were malicious, or were uncaring about the way it was done the penalty will be stiffer.
Regardless of what a DA says, deals get better and better as you get closer to your actual trial. NEVER take the first deal and don't listen to threats about withdrawing the deal. If they were going to withdraw it they wouldn't have made the offer. Especially if there is a possibility the DA can't make her case, the deal will get better as you are walking into the Courtroom for trial. I've seen it dozens of times.
So, sit tight on the case end. Build your case, don't do anything stupid like TALK to anyone about anything related to you in your case. Obviously don't get into anymore trouble either. Be an angel, a quiet one. If I was your lawyer I would have a fit about even coming here and asking questions.
2. Your child is a different matter. You didn't elaborate on the type of trouble he is in or whether you were involved either directly or by neglect. I'm not accusing you of anything just wondering.
I'm not absolutely certain of your State rules but I personally would do something a bit more substantial than a Power of Attorney. You can sign over Temporary Custody to your Mom. Temporary Custody is revocable so you can pull it back at any time if your Mom starts to be possessive of the child or starts doing something you don't like. On a State by State basis it has an expiration date. Here in GA I think its a One year grant that automatically expired if not renewed.
Usually you can go to the Juvenile court and they have a form. Your attorney might be willing to help you out with this because its easy for him/her and is an issue potentially arising from your prosecution.
If you make plans for the care and control of your child, and deal with whatever mischief he has gotten himself into, you should be able to head off any deprivation or neglect action that your criminal problems might present.
Good luck. Keep quiet. Take care of your son.