Seller moves out AFTER closing?

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So it looks like I might be moving ahead on my first piece of property and I have a question. What I've been told is that the seller can't move out until after closing because he essentially needs the money to move out. I can understand that however I'm concerned that I could get hosed on this deal, if I close, he gets his money and he's still living there it could become quite a hassle if he decides not to move.

What I want to have happen is for the title company to hold half the funds that are the difference between the current lien and what my offer was. I'm thinking there is 50-60k in there. I want the title company to hold those funds until after he moves out. This should allow him to get the money he needs to move but also motivate him so that I don't have to deal with him deciding to prolong his departure after the closing date.

Is there some kind of standard form or verbiage to make something like this happen? Is this common practice for title companies in general?

Any help is much appreciated.