A pioneering study examined 640 contested trust disputes from thousands of civil filings in San Francisco Superior Court between 2014 and 2020 to identify estate-planning decisions and family dynamics that often lead to costly inheritance battles. The study revealed that a primary cause of conflict is granting one child control over a family trust while siblings or other relatives remain beneficiaries, creating power imbalances and disputes over trust distributions.
Nearly 25% of cases involved a descendant beneficiary suing another who was also a trustee, and 74% included allegations of trustee misconduct, such as breaches of care or loyalty duties. Almost one-third of petitions sought detailed trust financial accounting. Despite trusts aiming to simplify wealth transfer and avoid probate, disputes averaged 481 days, demonstrating how inheritance conflicts can be prolonged and expensive.
Settlement and mediation played significant roles in resolving disputes.
Researchers estimated up to 75% of petitions may have settled, with 85% of mediated cases reaching settlement compared to 47% without mediation. The findings suggest clearer estate plans, open family discussions, and hiring independent or professional fiduciaries can help reduce conflicts. Researchers also noted that no-contest clauses do not always prevent litigation, as their effectiveness varies by state.
