Legal Question in Real Estate Law in California

The correction process will probably be pretty simple IF everyone involved is in agreement as to what the final result should be ........ what about your sister, is she on board? Also, note that your mother's plan includes a testamentary aspect ("after she passes") which seems to require that a correcting deed is only part of the process.....she probably needs a new or revised will and/or trust for that purpose. I strongly recommend paying a lawyer with real-property experience to prepare the correction deed and arrange for signing before a notary followed by recordation. Careful attention to detail can avoid errors and problems with lack of clarity in the resulting recordation, problems with transfer and capital-gains taxes, etc. Then, or perhaps first, have her see a wills, trusts and estates lawyer (perhaps with the same firm?).