How can I manage this crisis?

At present I am linked up with a client who has three businesses running in his name. All the businesses are linked with one another. Now he aspires to have a website which can help him promote these three businesses. The site must have a kind of home page where all the categories are well linked to the above mentioned domains. However, I have spoken to my client and made him understand that Google does not want to get involved in such activities. This is not a legal process to be followed and I need help to make my client understand the issue.