A codicil is a part of a will modifying it in some respects and superseding it insofar as it is inconsistent with the original will. Fenton v. Davis, 187 Va. 463, 47 S.E.2d 372 (1948); Senger v. Senger's Executors, 181 Va. 786, 27 S.E.2d 195, 197 (1943); Simmons v. Gunn, 156 Va. 305, 157 S.E. 573 (1931). A will and codicil are construed together as one single instrument.

In Fenton v. Davis, 187 Va. 463, 471, 47 S.E.2d 372, we approved the definition of a "codicil" as "an instrument made subsequent to a will and modifying it in some respects — and forming part of it, superseding it so far as inconsistent with it." In Senger v. Senger 181 Va. 786, 789, 27 S.E.2d 195, we said: "The function of a codicil is to add to, supplement or alter the provisions of a will." "A 'codicil' is a supplement to, or addition to or qualification of, an existing will made by the testator to alter, enlarge, or restrain the provisions of the will."