As Janet said, needed dates and places of birth. Which, in both our cases, needed checking -- long ago, in a far-away land. And vague.

Compounding the problem, both my parents had passports*. Since we live in the age of The Big Computer, I wanted to be sure I used the *same* made-up dates, in case of cross-checking.

*I shredded 'em, cleaning out Mom's house.