What Is Undue Influence in California Estate Law?

Undue influence is excessive persuasion that overcomes a person's free will and causes them to do something they would not otherwise have done, typically signing a will, trust, deed, or beneficiary change that showers the influencer with assets. It is the most common ground for contesting California estate plans, especially those changed late in life.

California defines it in Welfare and Institutions Code section 15610.70, which directs courts to weigh the victim's vulnerability, the influencer's apparent authority, the tactics used, such as isolation, control of medications and information, secrecy, and haste, and the unfairness of the result. A presumption of undue influence arises when a person in a confidential relationship actively procured a plan from which they unduly benefit, and statutory rules void many gifts to caregivers and to the people who drafted or transcribed the instrument.

The proof is circumstantial by nature: medical records, the drafting attorney's file, phone and visitation patterns, and who drove the parent to which appointment. These cases pair frequently with financial elder abuse claims, which add enhanced remedies including attorney's fees.