If my son had an accident in my car, can they sell my personal property and my husband's (he is not being sued) or attach my wages?

It is possible, but more facts need to be known. And, there needs to be a trial first and an award against you. After the award, the plaintiff has to file to have the award turned into a judgment. With the judgment, the plaintiff can then execute on property owned by the defendant's he or she obtained an award against. The whole process takes time. Don't waste time in finding a lawyer to help you with this.