The value of the case is determined by many factors such as who was at fault for the accident, what were the extent of the injuries and whether or not there is insurance coverage for this particular accident. It is important that you consult with a personal injury attorney at length on this topic and make sure to get your son all the medical attention he needs. Good luck to you and your family.
South Carolina is a right to work state which generally means that unless she is employed as a federal employee, she can be fired for any reason at the employer's discretion. If she earned money while working the employer cannot withhold her pay. If she is accused of stealing money they may issue a criminal charge for her. However, DO NOT GIVE A STATEMENT OR TALK TO THE POLICE, until you have spoken to a lawyer. She has a constitutional right to lawyer and to have one present with her during...
Do not go to her house, this is most probably a trap. You may meet her in a public place as long as the trespassing notice does not apply to her personally and just applies to a residence or workplace, which is usually the case.
The better answer may be to contact child support enforcement. The court can order him back to court and a warrant can be issued for his arrest. When it is time for court, make sure that you come to court and ask the court to have him pay back child support.
You can file for a divorce and custody of the kids. In your case you will have to show and prove your claims to the court. Consult with a divorce attorney in your area who can help you with the process.