Rent back to the seller, should I even consider it?

[Ayne C.]

Im in a probate situation and the closing has extended 2 times already. We are looking to close on the 27th of this month but the seller needs more time to vacate. I'm considering a rent back. What should I charge for rent? Market rents plus a %premium? Or should I not even consider a rent back as a newbie?

It's an all cash deal with a wholesaler. I'm afraid they will abandon me and run at closing (of course they would) and leave me with a mess.

Should I encourage postponing closing again? I'm not heartbroken if she backs out.