More info for you: 1880 census dated 6-24-1880 Paris Township, Huron county, Supervisor District (SD)3, Enumeration District (ED)114, Page 34 shows: Nikedam Miller age 30, wife Anastazia age 24, son Joseph age 2, son Leon age 1 (this would be your Leo that you are looking for, so yes Nick & Leo are brothers), father Joseph age 62, mother Omheline (not sure of this spelling- handwriting on the census records isn't always easy to read) age 64.
1910 census dated 4-22-1910 Paris Township, Huron County, SD 7. ED 16, Page 5B shows: Nicholas age 59, wife Annastasia age 52, son August 19, son Albert age 16, son Victor age 14, son Aloise age 19, daughter Veronika age 8.Census noted that 9 children had been born to Annastasia and that they were all still alive as of the census.So far, I've found 7 of the kids.
I can't find the family anywhere in the 1900 census.
1920 census (same one that I gave you earlier) shows that son Leo age 40 was living couple farms away from his parents and his brother.Leo age 40, wife Frances age 33, daughter Debra(not sure of this name - handwriting again)age 13,son Frank B age 12, daughter Carol age 9, daughter Martha age 7, daughter Celia (not sure on this spelling)age 5,and son Earnest age 2