Greg,
You have a lot of ambition as I can see. But you're off track. First, and trust me on this. Never ever go into business with friends. And when it comes to relatives, especially parents, don't give them advice, and definitely don't ever go into business with them. They're not REI's, and your likelihood of convincing them to somehow become REI's is a waste of your breath. Dont' even bother. All they know how to do is work or whatever they do. You're the one who wants to become a REI, not them. So let them sell it.
Lease optioning is not a good idea anyway. You only lease option if the market is so utterly bad that you can't sell, so you have to resort to finding people who don't have money. I would never ever ever consider lease optioning anything. And who ever told you lease optioning is good, is crazy. Either rent it, and keep the equity, or, sell it, get all the money now and use it for the next investment. But why finance the purchase of someone elses house. That's the worst situation you could be in. Which is why you never want to even go there.
However, that being said here's what I'd suggest. Tell them that you want to become a REI, and that you want to start by flipping a house. So ask them that after they sell off the house, if they can give you a small loan and help you to buy a house which you can flip. (now this would be a 1 time thing, and if you have any other way then use that first), but at least this might be a way for you to get a downpayment to buy a house. Then once you flip it, you'll pay them back and you'll use the rest to do your own flips, never going into business with them again, because it is risky to involve family. But it sounds like in this case they're about to come into a great deal of money, and you might only need like $10k of that money to get your first flip off the ground.
But my friend, please do not advise them to lease option. Who on earth got this lease optioning stuff into your mind? Lease optioning is a form of financing someone else's purchase. That's crazy. It's as bad or worse than carrying a VTB. You only go there if there's absolutely no other way. What you should do is get a month to month renter in there to cover the mortgage. Meanwhile continue trying to sell it using the MLS only so that thousands of realtors will have access to it. I would never ever lease option anything. Also don't give any friends or family advice on financial matters. Trust me on this....if you want to lose friends, lose family members, and or damage those relationships, then by all means give them advice on financial matters and go into business with them. Because once something goes wrong, and it always will, and their's a disagreement, then this priceless relationship becomes tarnished and damaged. Never ever go there. You can put an ad in the paper or do some networking at a REI's club to find partners or investors, which if the business plans fail and they get hurt, and never want to talk to you again, is no big deal. But if you're own parents and or friends don't want to have anything to do with you, well that's got to be the worst. And people make those kinds of mistakes all the time in life. So learn from others. Just watch those Judge Joe Brown episodes where two relatives never want to talk to each other and are now suing each other over a small loan. Never do business with friends or family. Why risk a priceless relationship over a few hundred or thousand dollars? That's insanity. Also don't even give friends or family financial or business advice. Because if they take your advice and for some odd reason it doesn't work for them and they end up losing their shirt, then they'll blame you for it, at least partially. Friends and family should be there for fun times, good laughs, holidays, get togethers. And when it comes time to do business there's plenty of very knowledgable people in the industry, or else people with deep pockets that you can find out there who you can start building business relationships with. But keep them separate. Anyway enough said.