Current Duplex Owner Will Continue to Live in Duplex Once Sold

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Ok guys, I am 100% new to this, so go easy on me. I am looking at generating passive income over the next few years with some buy and hold duplexes. I am going to go view a few this upcoming weekend and have a question:

I am looking at a unit that is currently occupied on one side by its owner and on the other by a tenant. The owner has stated that they would continue to live in the unit once sold, but just didn't want to deal with owning it anymore. 

I am a bit nervous that the current owner might feel some form of "privilege" having owned it. Basically I dont want this to end up being a relationship where they think they can tell me what to do as they have owned the property for years. With this being my first deal I dont want to make it any more difficult than it has to be. 

Has anyone else dealt with this? Did it end up working out ok for you or was it something you ended up regretting?

Any and all help would be appreciated. Thanks in advance!