Foreclosure: How to evict a non tenant, non former owner?

[Liliana Lopez]

I bought a foreclosure house on a online auction but the house is occupied. I went to talk to the person living in the house but nobody answered to the door so i left a note with my info in the mailbox but never got a call. I went back few days later and the person living in the house is the former owner's nephew, he said his uncle died last year and he didn't know the house was sold. I gave him the 3 day quit letter asking him to leave and he told me that he went to see an attorney but he needed at least 30 days to move out. I told him I understand but I really needed him out in within 2 weeks. What do I need to do if he does not want to leave? He doesn't have a lease contract and he is not the former owner. Does he has any rights on the property? I have never had to evict anybody before so I am clueless on what the process is. Help!