Pam, the website makes it sound like you have to prove all that, but the records are open now because he died so long ago. You should be able to order the death certificate with minimum documentation. I suggest you call them for clarification of their requirements.
As for upvotes, etc, saying Thank You here is enough for me. Otherwise, there are the vote buttons left of each answer, the Best Answer star to the right of each answer, and the Thank You system. To use that, go to George's profile and click the Changes tab. There should be a list that includes people who answered a question about George. On each line, there should be a link to send a Thank You. WT provides many ways to show appreciation!