My Alwin Engelmann farmed orginally in Carver County, he later moved to Bertha, MN where he died 7 Oct. 1941. He is buried in Lester Prairie, MN (very near Howard Lake) next to his second wife, Anna Hoge. Alwin and his first wife Johanna Noeske had the following children; Henry, Emil, Herman, Robert, Paul, Bruno, Mathilda, Carl and Anna. I don't know where you Alvin fits in.
I just found another Engelmann family; Diedrich and Anna Klancke in Carver county in the early 1900's and I don't know how they are related either. From contact with other researchers I believe Alwin and Johanna to have ties with the Menzel and Heuer families. Any ideas on these surnames? I don't have definite leads on any of Alwin's siblings