We call them a single family home because you are only purchasing one, and only one family can live in it. In our mls, multi family homes are duplexes, triplexes, etc... If you buy more than one housing unit in one structure, then it becomes multi famliy. I hope that makes sense, and I can definitely see how it could be confusing. If you need any help with your search, I would be more than happy to assist you. I can be reached by email at email@example.com. Good luck! It's a GREAT time to buy!!