Thanks so much for answering. I've found Ernest Irmischer (1860-1918?) and his wife Pauline (or Paulina) Hyneck (1684-1914) living in Ellington, Tolland Cty, CT, by 1900. Ernest emigrated here from Germany in 1890 (Ellis Island passenger list). He died between the 1910 and 1920 Census, perhaps 15 Oct 1918 (FamilySearch). They had 7 children that I can find: Albert & Annie (b. in Germany), Frank (my friend's gr-grandfather), Emma, Paul, William, and Otto. I cannot find any records for Millie & Nellie (or any of their possible proper names), although my friend says they were indeed part of this family, b. about 1903 and 1905, respectively.
I'm having problems finding information about Frank (b. 9 Mar 1891 at Ellington; d. ??) and his wife Louise M. (b. about 1890; d. ??) who had Oscar E. (b. about 1922 at Rockville CT, and Lois A. (b. about 1927 at Rockville).
Do these sound like your relatives?