Can you help me with my SEO queries?
 

I have a customer there are three companies. One of his businesses is very closely interlinked. The customer wants to make the web site of all three companies. His plan with three kinds of different categories will be connected to the home page of the domain, because in the future, he hopes to create a personal website, his three businesses. This concept does not support from Google, I believe they will punish a webmaster has a similar idea and website. Anyone can put forward my proposal and to discourage my clients from such a way?

Could you having the minimum requirement of to create the website of that customer need.