Seller Stays 30 days after closing!!!!!????

[Joshua D.]

So my brother is buying his first house in Northwest Ohio.  He is suppose to close next week and was telling me that their contract with the seller stipulates that the seller can stay in the Home for up to thirty days after closing...  I kind of freaked out for a bit and he called his realitor and she said this is "normal in their area and happens all the time" 

The sellers are an older couple and have TONS off stuff and need time to move out... they have not started moving at all yet even though they have had a contract for 45 days now.  

Is it just me or could my brother be in for a mess!   Is this actually normal?