One possible brother was Albert Lentz. I am convinced, after seeing an image of him online and the brief family pedigree someone added to Ancestry, that he is indeed an older sibling of my great-grandmother Augusta. He was born in 1842 in Prussia. A brief notice of his death appeared in the Los Angeles Times on March 31, 1921.
Albert married a woman named Wilhelmina Lange. She died in 1895 in Germantown, Codington County, South Dakota while giving birth. I don’t know if the child survived. He remarried at some point, and his second wife shared the same name, Wilhelmina. Her surname was Martins.
I will see what more I can find out about him. He may very well be the reason my great grandparents immigrated from Germany in 1887. He arrived years earlier. I will be looking up the details and sharing.