I believe that the questioner is under a mis-understanding of what is occurring.
Apparently the son had ALREADY previously been charged and convicted on a robbery-related charge and was sentenced to probation. (Note: Probation IS a sentence for being found guilty!) One of the conditions of being on probation is that you must live under certain guidelines, conditions, and restrictions on your life and freedom of movement - that is the trade-off for remaining out of jail.
However, when you violate the provisions of your probation it can be revoked and you could spend the remainder of your original sentence term behind bars. It is not necessary for the police, or anyone else, to have to "re-open" anything, it is virtually an almost automatic process. Besides, the police do not "re-open" cases, only the prosecutor's office has this power.
If the son's probation violation involved the commission of a new offense for which he was arrested, in addition to having his probation revoked he can also be charged and tried for the new offense.
NOT if you were charged and convicted of a FELONY.
depends on what the probation was for.
NO.
This depends on the exact charges brought, and the prior record of the person charged.
If I understand the question correctly - - - you are on probation AND you got caught with a shotgun in your car. If that is the case - your probation will be revoked and you will go to jail, AND be charged with a new offense (possibly federal as well) of felon in possession of a firearm). Congratulations! You are now eligible to spend 15 years in federal prison.
Difficult to answer - too much is unknown. You can be pretty sure that they will be returned to jail/prison to serve the remainder of their original sentence. In the meantime they will be charged and tried for the firearm possession offense, and that sentence will probably be added onto the top of their original sentence. If the felon was charged under the federal statute they could be imprisoned for up to 15 years on the firearm charge alone.
He was charged with attempted assassination of the President of the United States, assault on a federal officer, use of a firearm in the commission of a federal offense, multiple counts of assault with attempt to kill, and carrying a pistol without a license.
Felony
Depends on how good your lawyer is.
Yes. Unless it was felony probation. Only felony convictions limit your ability to possess firearms.
depends on jurisdiction and judge. Commonly revocation of probation, and imposition of remaining sentence of the original crime.
Each firearm can be a different charge. 10 firearms means 10 different counts.