Hello again everyone, somehow time has flown enough that it is time to apply from citizenship! I have being seeing conflicting information online so figured to ask here - what documents do I actually need to send with my n400 application? The one I am most curious about is my ex's proof of citizenship - I have a copy of his expired passport but nothing recent and there is no way I will be able to get it so not sure if it is required, and if so, what to do?