If you have a limited income, the judge can reduce the probation fees. You would need to go back into court and ask the judge to modify the probation fee. You could also ask the judge for jail credit towards your fines. Some courts will do that and some courts won't. Good luck.
While it is considered his sole and separate debt, any collection efforts can come after his half of community assets that you accumulate after the marriage. You need to find out how much he owes and if he is actually making payments per a court order. You may want to have him pay it off before walking down the aisle.
Arizona doesn't expunge, however, your husband may be able to get his conviction "set aside and dismissed." What you need to do first is go to the court records department of the court where your husband was convicted to look in his case file. Get a copy of the plea agreement and the sentencing document. These will tell you whether he can even get a misdemeanor. Once you have the documents, call a lawyer so they can advise your husband on what to do next.
Parole time is calculated by DOC and is not something a judge is involved with. Parole has to be "earned" with good behavior in jail, etc. so there could be a reason that your brother is not getting paroled. Without knowing all of the factors, it is difficult to tell you why they want to keep him an extra 3 months. It is my opinion, however, that a judge would not intervene on this issue. Sorry.
Where was the open container found? Did it belony to one of the passengers? Did the others deny it was theirs? Did you know it was there? You may have some defenses to the charge. Feel free to call me to discuss.
Arizona does not expunge convictions. As far as getting a conviction vacated and set aside, there are some types of convictions that cannot be set aside. Reducing to a misdemeanor is also only allowed for certain levels of convictions. I suggest that you contact an attorney so they can speak with you in depth about these issues.
Did they ever ask him to give a urine or blood sample? If so, then they will likely file DUI charges if it shows some drug in his system from the test results. They could also charge him with possession of marijuana. Your son may receive a summons in the future for these charges. At that time, he would need to go to court to address it.
If there was a warrant out, then the tickets were likely criminal in nature. He probably will need to post a bond in order to get out of jail right now. If he doen't post a bond, he will be taken to court. Sometimes a court is willing to give credit against fines for time spent in jail but your friend needs to ask the court or his attorney whether that is possible. The court will want to know why he failed to pay his fines and he better have a good answer.