I am not sure whether this is a good idea, but you can try this. Fill in 0 or a number that is larger than 31, then print the form and let your father explain to the VO that he desn't remember the date. You just have to do this for the most recent one, for other visits, you can put down month and year. Good luck.
try this
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• Right, you might input a number, then explain -urfriend- ♂ (31 bytes) () 12/08/2006 postreply 06:30:02