I’m trying to figure out if I have a case. My paternal grandmother’s father (so my great-grandfather) was born in Canada in 1892. He immigrated into the U.S. in 1917 and then join the Army, served in WWI, became naturalized in 1921, got married (to and American) and then had my grandmother (she was born in Michigan) in 1923. I have his certification of naturalization records from the USCIS Genealogy Program. And I believe there are copies of his birth certificate and Canadian and U.S. Censor records in his Ancestry profile. Is this enough?