A blank card with a small handwritten thank you will most likely mean more than the gift itself.

@Geovanni Heredia you contact a local real estate agent and they possibly can provide you with a blank lease.Option 2 get the online lease and use it as a rubric for an attorney to revise.

@Clancy Johnston its a mobile home park with no mobile homes; blank slate

Only one I’ve seen break out a ladder and get into the attic space on multiple occasions.

Can I leave those blank? 

i see two options here 1) you can go back to dad and break it down as hey i cant close on the house until it's vacant and see if he can help in getting them out, 2) offer some moving expense if the lot is really that desirable to you I know not what you want to hear as the investor but it has worked on numerous occasions, 3) you will have to take it to the courts as final resolution so the sheriff can remove them.

> I've been renting out his house for a number of years, to help pay his assisted-living costs;y'all have helped me with that on a couple of occasions! 

Does anyone use a letterhead, or just keep it blank?

The text of the contract as it relates to obtaining financing reads: (b) This Contract is contingent upon Buyer obtaining approval of a conventional FHA VA or other ______________ (describe) loan within _______ (if left blank, then 30) days after Effective Date (“Loan Approval Period”) for (CHECK ONE): fixed, adjustable, fixed or adjustable rate in the Loan Amount (See Paragraph 2(c)), at an initial interest rate not to exceed _______ % (if left blank, then prevailing rate based upon Buyer’s creditworthiness), and for a term of _______(if left blank, then 30) years (“Financing”).

Aside from that rare occasion, the longest I've gone without a tenant is about 3 weeks.