Legal Question in Family Law in Georgia

You can't file anything because you are (we assume) not a lawyer, and can't file on behalf of another adult. Your son can file the paperwork if he knows what to file, and knows what to do after that. Alternatively, he can hire a lawyer to do it timely and correctly the first time. As far as what you think is "reasonable," there is no schedule of fees. Lawyers charge based on the market and their experience and expertise. If you have received quotes from several lawyers in your area, that is probably the "reasonable" range in your area.

Since your son is 18, he and not you has to proceed. You cannot represent him unless you are a lawyer.

If your son is in or near metro Atlanta my office handles such matters. The fees vary by county but the legal fee we charge ranges from $299 to about $500. Courts will charge around $205-$220 in filing fees and the county's legal newspaper will charge a fee ($80 in most counties, $40 in a few).

To proceed pro see, he'd have to know what to prepare and what to do in court. He'd still owe the filing and newspaper fees, so given the minimal attorneys fees and the risk that he could mess it up, he should get counsel.