I've spent many hours looking through this website and appreciate the information so much. I am going to file Form 21-4138 as the informal claim for my mother-in-law, who is the surviving spouse of a deceased veteran. I have seen the information on this site as to the language to put re: 38 CFR 3.155 Informal Claim. I know my mother-in-law needs to sign the form, but do I put her name in the blank at the top where it asks for the name of the veteran (and use her social security number) or do I put her deceased husband's name (and social security number)? Thanks very much for your assistance.