I have a family interested in doing a lease to purchase on my house. I want to create a contract that is both fair to my tenants and advantageous to myself, and also meets the legal requirements for such contracts ...

I bet you'll enjoy it here!

They get listing data from each MLS free of charge - a service that is paid for by Realtor fees and enforces strict guidelines to ensure accuracy.They then put together great front end search tools to attract lots of buyers as well as marketing the heck out of their service.They take those buyer leads and sell them back to Realtors.

I would be willing to hold the property betting on appreciation in this case.

They each have their own little quirks, and some additional guidelines have been established by "case law."

So I'm betting there is no deal or it wont go through, and this is just a tactic to get me to go up closer to asking at $129k which wont work.

Hmm, well I would be willing to bet some of these tenants friends/family figure out its free and other people would find their way into your pocket.

Your best bet might be to drive out and check things out in person.

It's the federal government though so you can bet that they aren't very flexible and can't make changes or exceptions when someone messes up a bid.  

A 30 year loan is a safe bet for few reasons.