Do you have approximate years of birth for Alexander and Elizabeth? Kansas also had censuses for 1885 and 1895 on which they might be found. I looked through the index for both years, but the closest I could find was the one attached. Only one of the childrens' names match up (although it may have been that most had not been born yet, as the census I've attached is the 1885 Saline Co.)
Have you searched Findagrave for Elizabeth? Not knowing her birth year, I couldn't decide if she was listed.