Grandparents died my mom bought sisters half from her but recorded the title wrong

[Chris Hames]

Hi everyone, we are in California. My grandparents passed away three years ago my mom decided to buy out her sister's half of their home. She transferred the money into her sister's account. However, when they went to record the new title they made the mistake on the form of writing that my grandparents were trustees when they should have wrote that they were joint tenants on the form. My mom wanted to use a lawyer and they even went to a law office together but it was really busy and my mom's sister said, " I don't really want to spend money for a lawyer and said lets just go." Now my mom is being told that the home was recorded wrong and they might need her sister to sign again. She is waiting to hear back from the bank. My mom and her sister kind of had a falling out so I don't know if her sister will co operate. Is there a way to get the home recorded correctly without her sister? Since my mom wired all the money into her sisters account and she has a receipt of payment for the house will that be sufficient to prove that the house is my mom's if necessary? Or is the home legally still half her sisters? Will my mom have to take her sister to court if she won't sign the papers? (Her sister lives out of state and don't even know where she is now. So she probably won't be willing to sign)

Thank you for any advice.