Legal Question in Real Estate Law in California

Answering this would require looking at the terms of the particular financing instrument, and maybe the sale agreement itself. However, I'd say in most cases there isn't going to be any easy way to do this aside from paying off the current financing and getting an entirely new loan, and even this is not easy-as-pie. The rule of thumb is that while you can make the payments, your agreement to make the payments does not replace or remove the father and daughter from liability. By the way, why would you want to do this?