You should file the current DBA with the EIN that has been assigned to it, if your son has employees. If not, then his social security number (SSN) will suffice. If he wants to change the name of his 'doing business as' (DBA) company the state may require him to ask permission making sure he is not taking a name already established. Check with your state for the required procedure before applying for a new name or EIN.
Secondly, a new EIN would need to be obtained if it will be used because of employees or an entity change. Entity is partnership, limited liability company (LLC), corporation or s-corporation. The IRS has a method of identifying a business name and EIN for the reasons noted. Likewise they do not want to issue an EIN when it's not required.
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