1 One, such as a parent, grandparent, great-grandparent, who precedes another in lineage. 2 Any relative from whom one inherits by intestate succession. ancient document See document. adj. ancillary Auxiliary; collateral; dependant; supplemental; subordinate. n. ancillary administrator A person appointed by the court in a state where the descendant was not domiciled to manage the assets and liabilities and to oversee the distribution of decedent's estate in that state. Such an administrator u...