Sara - Yes! I believe that your Ggrandfather, Jacob Reimer's parents were Aron Katherine (Trodel) Reimer. They came from Russia, via Hamburg, Germany, on the SS Harmonia in June of 1876 arriving in New York City. Your GGgrandparents, Aron Katherine, traveled to America with Aron's brother, Jacob Johann his family. Jacob Johann also had a son named Jacob, born approximately the same year as your Ggrandfather, he is my Ggrandfather. Please email me at firstname.lastname@example.org
as I have more information I'd love to share with you.