If you believe financial abuse of the elderly took place (see, Welfare & Institutions Code sec. 15657 et seq) you have four years from discovery of the abuse.(W&I 15657.7). Since your mother had a will, the named executor should probate the will, and seek recovery of the property under Probate Code sec. 850. The two statutes are not mutually exclusive and can be used in conjunction with each other. Find a good attorney who specializes in probate/trust litigation and elder abuse for more specific analysis.
Probate Code Section 21360 and following provide that under certain circumstances a transfer made as result of undue influence can be deemed to be void. I suggest that you and your siblings retain counsel and determine what your rights are.
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The linchpin to be determined here is your mother's intent at time of the conveyance to your sister. You have to find out from your mother's treating physician, her state of mind and competence. The determining factor is your mother's medical record at the time of conveyance. Edward C. Ip www.lawyer4property.com
No attorney / client relationship established. The answr is for discussion and general information only. The lawyer had not reviewed any documents or contract prior to the above comments.
It is really important that you act swiftly to contact and discuss your case with a knowledgeable probate litigation attorney. Since your mother died recently, her medical records and witness testimony concerning her mental state and mental capacity will be available for discovery. Witness recollections fade rapidly. If your mother had a treating physician during the last two or three years of her life, your attorney might want to start with an interview of that physician. Also gather together all of your mother's estate planning documents so the attorney can examine them. Your attorney will proceed if he or she believes that you have a reasonable chance of winning.