@Ryan Louie, do you have some kind of written document documenting the arrangement?  

You know what @Joshua Hill, I myself have been contemplating the same thing.

What would be option for financing I could suggest to a seller of a single family home.Owner (seller) contacted me and want to sell us their house, the owner is ill and son has lived with him for past 8 years, They would like to be able to rent the home from us for the next 2 years after we buy it. this would be private sale no Realtor fees.What is a good way to finance with out a bank, I have cash and could pay about 2/3 of cost of house upfront and do some type of arrangement for payment on balance.

Great idea on two separate arrangements.

I doubt the seller is going to turn over keys to you; you'll have to make arrangements between the buyer & seller.

You'd need to sort out all of that in advance and make your lease really explicit about the arrangement, because it seems like they could be easily taken advantage of if they don't completely understand the setup.  

Lately I have been contemplating the whole "tiny house" takeover.  

Why not arrange for mechanic's lien settled at closing?

I have been contemplating a direct mail campaign, this is great encouragement.Congratulations on the nice investment!

Maybe a credit partner would be the answer I might need to work my network but usually what is a good arrangement / agreement on this situations ?