If you want to credit them something, in the contract you both enter into when they want to exercise their option and purchase, you may opt to give them the amount of the option payment as a credit towards the purchase price. 

Hi BP,Recently I fell out of my routine of eating healthy, exercising, reading ,etc (essentially dropped a lot of my good habits).

And not all LPs are good and I've seen them exercise control provisions when other groups might not have. 

Because tax deferral is an incredibly powerful force that will change your life if you exercise it with discipline and consistency - particularly when you're young.I think the situation is really more like what @Jay Hinrichs said. 

When they exercise they can get a new loan. 

Doing the number on paper is just that - it's a numbers exercise.

I highly recommend attending several auctions to get a feel for how they work but unless/until you have liquid cash ready to go, anything else is an exercise in futility.

Now, for me, it’s exercising the knowledge I already have.

That used to satisfy my exercise requirement.) 

This is a major trust-rebuilding exercise for both of you.