there seems to be a sister Sophia Wilhelmina Stoppenhagen. I found her at Familysearch.org. Her data was submitted by Donna M Stefani from Illinois. You might want to contact her....
Sophia Wilhelminas father Ernst Stoppenhagen (Stevenhagen, Steffenhagen?) was born 1814 in Windheim, Germany.
Please let us know when you find more siblings. They might fit into a branch I have been researching.