My Great Grandfather, Gregers Juhl, was born in Schleswig in 1850, but he had no brothers. He was one of 6 children born to Eric and Anna Juhl. Our history indicates one sister was also in the US - Mrs. B. P. Peterson, from Buena Vista County Iowa. Eric Juhl was a wagonmaker in Denmark (area is also considered Germany, depending on the time period).
Gregers (my great grandfather), came to the US at the age of 17, and first farmed in Lee County Iowa, then moved to Emmet County Iowa. Many of his descendents still live in Emmet County Iowa.
If anyone can make a connection to additional family from Denmark, let me know.