u/Deckel_FP2

I think this should be a pretty easy one, but I'm not really sure. I am having a hard time finding where I fill out applications and send documents, so any suggestions there are greatly appreciated. Here are the details of my "blood" line:

• Grandmother: born 1892, Steinau, Silesia, Germany
• Grandfather: born 4 March 1887, in Steinau an der Oder, Steinau, Silesia, Prussia, Germany
• Grandparents married and emigrated to Canada in 1913 prior to having any children. I am 95% sure they never became Canadian citizens
• Father: Born 1920, Canada
• Entire family immigrated to the USA and became naturalized US citizens in 1931
• Father married a USA born woman (my mother) prior to my birth
• Myself: Born 1962 in USA

Item of interest:

When my father naturalized, he was 11 years old and, therefore, did not voluntarily renounce German citizenship as an adult through naturalization. My understanding is that modern German law has recognized that he retained citizenship and hence was a citizen throughout the remainder of his life (and, obviously, at the time of my birth).

Questions:

1. Do I have an "easy" claim to German citizenship? If so, how do I go about doing this.
2. I assume that I need some type of proof of my grandparents birth in Germany. How can I obtain this? Are USA Naturalization documents, which should show their birthplace, sufficient for an application for German citizenship?
3. If my citizenship eligibility is jus sanguinis, do I need to pass any German proficiency test?

Many thanks for thoughts and help!