Cal. Civ. Code § 1575 : CALIFORNIA CIVIL CODE — OBLIGATIONS — CONTRACTS — NATURE OF A CONTRACT — CONSENT — Undue influence

Undue influence consists:

1. In the use, by one in whom a confidence is reposed by another, or who holds a real or apparent authority over him, of such confidence or authority for the purpose of obtaining an unfair advantage over him;
2. In taking an unfair advantage of another's weakness of mind; or,
3. In taking a grossly oppressive and unfair advantage of another's necessities or distress.

Ca. Civ. Code § 1575

Enacted 1872.
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