Children of DIDYMAS BENSON JARRAD & ELIZABETH FRAZEE

I have put together 8 children born to Didyms & Elizabeth Jarrad from census records in Iowa and later Nebraska: Allen (b abt 1855 in Iowa), Janette (b abt 1859 in Minnesota), Adelaide (b abt 1863 in Iowa, Mary J (b. Mar 1865 in Iowa), Ina (b. Nov 1867 in Iowa), John C (b. Apr 1872 in Nebraska), James B (b. Jul 1874 in Nebraska), and Leo D - twin to James (b. Jul 1874 in Nebraska.) The latter five children DIED from Feb 10th - Feb 17th, 1880, in Clay County, Nebraska, of SCARLET FEVER. I have found their names in the mortality schedule verifying this, and have found them buried in Anandale Cemetery in Clay County. What I cannot find is a record of what became of the oldest three children: ALLEN, JANETTE AND ADELAIDE. No children appear in the household after 1870... and the five died in 1880. Does anyone know anything about the oldest three children? thank you