Distinguish between "Client" and "Contact"

There should be a better way to distinguish contacts from clients. A client might be Mr. and Mrs. Smith. The contacts would be Mr. Smith and Mrs. Smith - two separate contacts. Those contacts would then be linked to the client, Mr. and Mrs. Smith. if Mrs. Smith has her own business (another client), her contact would be linked to that client as well. Those contacts that are attached to a client should all be visible from the main screen