XyzUser...
MY interview letter said the same thing but from my experience that letter is printed by computer. so dont go by that. it all depends on examiner, what he wants to see according to ur A file. i was not asked to provide my wife's birth certificate BUT i was asked to show that, it didnt ask me for tax returns but i was asked to show my last three years tax returns,200-2001-2002.
and marriage certificate... i was lucky that i took all the documents with me in case... and was asked to provide them...
I suggest u take ... last three years or 5 years tax returns, ur passport, green card, marriage certificates, birth certificates ( ur and ur wife's ) any phone bills or bank statements.and selective service registration number... ** if it applies to u **
selective service is one important issue in N 400 interview... if u are age between 18 and 26 year or age u must register.
Good Luck...
Shaky...