Legal Question in Wills and Trusts in California

I'm not sure what you mean by the will hasn't been "validated yet." In any case, however, you need to open a probate case and lodge the will with the court. If the will does indeed leave the house to you, you will receive court papers that get recorded in the county recorder's office making you the owner of the property. While that is all being handled, the executor of the will needs to work with the bank and you (or if you are the executor too, you need to work with the bank), to determine if you can assume the loan or if you have to finance the debt into a loan in your name. If the bank will not let you assume the loan, you have to pay it off, either by a new loan in your name, or by selling the property, paying the loan and taking whatever is left.