I don't know the answers to some of the questions on the 21-527ez and I don't think my Dad is able to really answer me due to his dementia. Do I write 'I don't know' or leave blank or just fill in what I do know? The questions I don't have the information for are: Have you ever filed a claim with VA? I don't believe he has but I am not sure. If he did, it was way back in the 40s. Also, he has VA Life insurance so would that file number be the same? How can I find out? Date/Month/Year of his first marriage. I know my dad's 1st wife's name but not when they divorced or married. Tell us about employment for one year before you became disabled. My Dad retired 13 years ago and received his dementia diagnosis about 5 months ago. Does this mean I can leave this question blank?