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Are my parents ripping me off with this deal that doesn't allow me to build my equity in my home?
No It's not a loan. It's an equity investment. Think of it as a business. The parents bought 75% of the equity with $115K, and are entitled to 75% of the sale proceeds, should you someday liquidate the business (i.e. selling the house). The $500 per month is just business revenue and is paid to your parents as a dividend. Imagine you rent it out to your self and charge a $666.66 rent - you take 25% of that back and give your parents the rest. Like any equity investment, the risk for them is that if the value of the house goes down, they will have to shoulder the loss.  And you are right, there is no way to build equity. You already sold that to your parents.