Hey, they wont give business visa to your son. But in the visa application of your wife, please add/put Companion and give your son details in it. They will give approval to your wife and ultimately companion will get approval.( dont fill separate application for your son). I suggest you contact your company PRO for more details. For your wife, better attache her education degree certificate to make the case stronger, as sometimes applications get rejected for ppl without degree certificate. Hope you will get outa trouble smoothly.