I couldn't find Otto in the 1930 or 1920 censuses. He didn't appear with Jacob and Alma in 1910. As it turns out he lived on the same street with his wife and daughter:
Alvina is listed as a widow. But was she? Not according to Otto's sister Alma:
Birth, marriage, and death certificates, naturalization documents, old family photographs, newspaper clippings, yellowed maps, obituaries...to a genealogist, it's all relative.