Dependent relevant revocation (DRR - also known as ineffective revocation) is a doctrine in trusts and estates law. It makes a revocation of a former will
ineffective if the testator
made the revocation through execution of a new will, and that newly executed will is determined invalid. Said differently, the former will is revived when the new will in which the former will was revoked is found to be invalid. Without DRR, both wills would be invalid and the testator's property would pass through intestacy. The theory behind dependent relevant revocation is that the testator revoked the first will only on the condition that the second will was valid.