The address book is organized around individuals and it is expected that each individual will have their own record. As long as you have multiple entries even with multiple names in the same address book record it would be seen as multiple addresses for the same individual. The easiest suggestion would be to separate each of the individuals into their own unique address book entry with the same company name in each. You can find individuals in the address book by company name. If you entered John’s plumbing you would then have your choice of four different names and addresses to select from and instead of the messages being grouped under John’s plumbing they would be grouped under the individuals name.
If we knew what it was we were doing, it wouldn't be called research, would it?
— Albert Einstein
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