1. Maintain two individuals, think husband and wife, under one Organization so that i can email them separately 
AND 
2Maintain numerous individuals at a company, like a Real Estate office, so that i can email them separately 

However, when i go to create a mailing list, I create one that's contains once record for the husband/wife scenario and unique records for each individual in the Real Estate office scenario. 

I apologize if this isn't clear enough. Thanks!