"The very purpose of requiring a will to be in writing is to enable the testator to place it beyond the power of others, after he is dead, to change or add to his will or to show that he intended something not set out in, or different from, that set out in his will."
Wills: Writing Requirement
Wills must be in writing in order to be valid, but not necessarily paper. The writing requirement is met long as the will is written in some more or less permanent medium.
Huffman v. Huffman, 339 S.W.2d 885, 889 (Tex. 1960).
