And the owner is very responsive to questions or issues (emailed him at night and received a reply within a few hours).  

If you aren't paying cash and are doing owner occupancy you may be able to use FHA instead of Conventional with a higher down payment. 

There is a house (2b x 1b) in the family I was interested in becoming the owner of.

So he bought up several owner financed properties that offered 0% down, and he cash flowed. 

This property is ready to welcome its next owner with no repairs or updates needed.

So for the past three weeks they have been badgering the bank, going so far as to call the owner of the bank and every member between the underwriter and the owner.

As long as you are on the loan, on title, and live in the home for 12 months minimum, then your non occupying coborrower can qualify for 5% down at owner occupied rates.

I got a hold of the owner by looking up his information on the county website.

As an owner you're allowed to manage your own properties.  

Here is their description and note site Their terms state: "With whole note investments, the investor transfers the complete loan amount and is the sole owner of the 1st position on the loan.