[pxtreme75]

It is obvious that you need to think clear and not make this an emotional drama. We all, at some point, believe we are the perfect match for a job and we resist change. Also, at this stage of a company is really difficult to decide if you need more R&D or more sales persons. The chances are you need both but you could also go on with none...

That said, the fact that the person you are about to hire is the son of the adviser makes me wonder about his real motives. Also, it is clearly unproductive to impose a new technical member to your team without the CTOs permission.

What I would do would be to scrutinize the ability of your new candidate. Make clear that you are still the CTO. If you are not satisfied with him, just come back with a stronger argument. Otherwise, embrace him...