This question also stems from the stand point of separating the financials.  

Run your numbers and don't get emotionally attached to a property as I did on my first one.  

I have the costs of renting a separate room and having good food and better transport to work which is are a bit higher than those who skimp on these.

Consider any due on sale clause filing an option.Owner occupied, have a mortgage originator qualify the buyer.Do not put contingencies in an option that require performance, like paying rents agreed, it will invalidate the option making it a purchase contract, an optionee may not be required to perform in any aspect under an option.The lease and option are separate contracts, the lease may require performance, like paying rents as agreed.A residential tenant may not be responsible for repairs, IRS requirements.On a 3 year option, it will be better if you were to pay $3,600 as seller concessions to closing costs, she must pay pre-paids under most mortgages.

For that, you'll need to pay a separate fee to a hosting company and upload your site there.Another option is to use a service like wix.com which will help you create and host your site all in one place. 

Their marriage falls apart and they separate, but don't divorce.

But the contract doesn't have a line to separate the 10 dollars so I added to the agreed price (i.e $50,010) then put $50,000 due at closing.Should I just use another contract?

Everything was separated perfectly.

My recommendation to you is for you and your dad to set up an LLC for yourselfs; call it Caravalho, LLC and set up a separate LLC for this deal where Cavavalho and Contractor, LLC are partners.

I guess what I am asking is there any way for her to separate her RE business from personal investing.