Melissa - George H. Oldenburg's grandfather was my 3rd great grandfather b. 1796 d. 1856. He married Marie Lucie Wilhelmina Backhaus. I have been trying to dig further into George Friedrich Oldenburg Sr., but have not been able to do so. Do you have any info that may be helpful?
As to George H. Oldenburg - were Ethel and Frank twins, both born 03 Jun 1905?