Lisetta Reitz Eimer was my great grandmother and I have a little information to share. I was told that John Eimer's (b.1825) parents were Erasmus Eimer and Elizabeth Reeves but I've been unable to verify this. Sorry, but I have no information on Katherine/Gertrude Steinbock.
I've also been unable to find a death certificate for John. May I ask how you found his date of death (17 Sep 1903)?
Please feel free to contact me if you'd like to share other information.