Take a look at your brand system and correlation between sub-brands and the parent brand. Is it completely clear for an outsider? Can they be sure they know perfectly well what your brand family can help them with? If the answer is not a definitive "yes", you need to slice & dice it and develop a clear hierarchy. Your audience will have a consistent perception of your brand. It will also easily place any new product on its right place within the system. A new product won't need additional branding — it has all been done.
You'll have an elaborately outlined brand's architecture including principles of brand interaction and company's communication policy.