It is important to know that under California law, certain confidential or fiduciary relationships between the decedent and a beneficiary can create a presumption of undue influence, which can consequently invalidate a will. A confidential relationship can exist whenever one person places trust and confidence in another. The question of whether a confidential relationship exists is always a question of fact and depends on the circumstances of each case. Confidential or fiduciary relationships can include, but are not limited to, relationships with attorneys, trustees, family members and friends. Learn more.