Thanks for the advice Jon. You've given me some more things to think about.
As far as our financial picture goes, we are in a good place with our income vs. debt, monthly cash flow, and payments. Our credit scores just need time and continued good history.
The lease to own was a shady deal and we always paid our payment on time and improved the property. We discovered later that we were given a bogus appraisal and were stuck making large monthly payments for the house and not really having the option to purchase it and found somewhere else cheaper to live.
As for the house that I'm interested in. I wouldn't pay the $80k for it either. I agree that it's overpriced and had $60k or less in mind as well. My family is in home construction and remodel so I'm aware that it will be at least $10k and upwards.
I would never stiff my dad on the rent and if something came up where we were not able to make the payments. I would do everything in my power to either resolve the situation or help him find someone else to rent it.
Why does everyone automatically assume that you are a deadbeat if you've had credit problems? No one ever takes the time to consider that maybe you had some medical bills, tried to keep things going but lost your job and just couldn't pull out of the spiral.
I'd be interested in working with another investor to buy a house if they were ethical and legit. We were totally scammed before and I can't afford another mistake like that.
Thanks for your advice and comments.