"My grandfather married my grandmother, in Brooklyn, NY on Feb. 1892. She too immigrated, and was from the former German Province of Posen.(today PolandOlive Tree Answer: Dear David, I'm answering one of your 3 questions today as it is a very quick and easy one to respond to. A visit to Special Cases on my NaturalizationRecords.com website will provide you with the definitive answer you've been looking for.
I have never been able to find any ship manifests listing her, but my main question, is, since my grandfather was naturalized in 1890, did she receive 'automatic' citizenship as a result of his naturalization?"
Scroll down the page to the brief section titled WIVES.
I will answer your other questions too in a future blog post.